Closes #1139

Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>

* Fix for #828
Add build tags to ldflags and print in version output

Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>

* Reworked formatBuiltWith function

Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>

* Add tags to version information in admin panel

Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>

* Added new variable for use on admin page.

Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>

* Fixed incorrect indentation

Amended with string to bool change in API SDK.

Signed-off-by: Andrew Boyarshin <andrew.boyarshin@gmail.com>

to be an email address.

Signed-off-by: P.B. <puffybsd@yahoo.com>

* initial stuff for oauth2 login, fails on:
* login button on the signIn page to start the OAuth2 flow and a callback for each provider
Only GitHub is implemented for now
* show login button only when the OAuth2 consumer is configured (and activated)
* create macaron group for oauth2 urls
* prevent net/http in modules (other then oauth2)
* use a new data sessions oauth2 folder for storing the oauth2 session data
* add missing 2FA when this is enabled on the user
* add password option for OAuth2 user , for use with git over http and login to the GUI
* add tip for registering a GitHub OAuth application
* at startup of Gitea register all configured providers and also on adding/deleting of new providers
* custom handling of errors in oauth2 request init + show better tip
* add ExternalLoginUser model and migration script to add it to database
* link a external account to an existing account (still need to handle wrong login and signup) and remove if user is removed
* remove the linked external account from the user his settings
* if user is unknown we allow him to register a new account or link it to some existing account
* sign up with button on signin page (als change OAuth2Provider structure so we can store basic stuff about providers)

* from gorilla/sessions docs:
"Important Note: If you aren't using gorilla/mux, you need to wrap your handlers with context.ClearHandler as or else you will leak memory!"
(we're using gorilla/sessions for storing oauth2 sessions)

* use updated goth lib that now supports getting the OAuth2 user if the AccessToken is still valid instead of re-authenticating (prevent flooding the OAuth2 provider)

* Protected branches system

* Moved default branch to branches section (`:org/:reponame/settings/branches`).
* Initial support Protected Branch.
  - Admin does not restrict
  - Owner not to limit
  - To write permission restrictions

* reformat tmpl

* finished the UI and add/delete protected branch response

* remove unused comment

* indent all the template files and remove ru translations since we use crowdin

* fix the push bug

* make xorm log configable

* bug fixed for other sub commands except web

* rebase and fix xorm log

* bug fix for TrimSpace

Reported by Miguel Ángel Jimeno.

* Markdown rendering overhaul

Cleaned up and squashed commits into single one.

Signed-off-by: Andrew Boyarshin <boyarshinand@gmail.com>

* Fix markdown API, add markdown module and API tests, improve code coverage

Signed-off-by: Andrew Boyarshin <boyarshinand@gmail.com>

* Implement archive cleanup

Fixes #769

Signed-off-by: Andrew <write@imaginarycode.com>

* Make sure to close the directory file

* Resolve issues noted by @strk

* edit cheatsheet app.ini [ci skip]

* oops [ci skip]

* Remove superfluous defer calls

* Improve status table implementation as well

This would probably only help with large, high-traffic installs

* Redirects for renamed repos

* Remove unused phrase from locales

Avoid identical making calls to GetUserByID(..) in SignedInUser(..)

* Add ENABLE_PPROF to app.ini and start pprof if true on localhost:6060

* Add comment for golint to blank pprof import

* Add units concept for modulable functions of a repository

* remove unused comment codes & fix lints and tests

* remove unused comment codes

* use struct config instead of map

* fix lint

* rm wrong files

* fix tests

* Allow using custom time format

I need to use custom time format in `conf/app.ini' like 

    FORMAT = 2006-01-02 15:04:05

so that Gitea will display '2017-01-30 08:41:49'
check this answer for more constants to format date  <http://stackoverflow.com/a/20234207/2570425> 

PS: First GO commit

* Refactor and validate TimeFormat (must have 2006, 01, 02, 15, 04 and 05)

This change corrects a few logging issues:

 * Standardized formatting errors with '%v'.
 * Standardized failure warning word usage.
 * Corrected an instance of using the standard log library when
   the gitea log library should be used instead.

Remove unnecessary calls to repo.GetOwner() in context handlers

* Allow custom public files

* Gofmt code, lots of places not related to this pr

Closes #680