explicitly install sudo

delete superfluous environment variables

```deploy.sh``` in the docker container requires ```sudo```; this should resolve #127.

basic support for LDAP/Microsoft Active Directory authentication

fixed some broken forms in user settings

Missed one typo while fixing another... on the same line. Deplorable eff...

fixed typo

Changed 'setting' url to settings, and a small typo fix

Create the installation guide for gogs on ubuntu (src & binary)

Add Memcached and Redis Docker supported with MySQL and PostGreSQL

Add the sciprt for deplying gogs in docker, support the user to choose database(MySQL or PostgreSQL) and memory cache(redis or memcached).

Fix grammar

Minor grammatical fix for Disable Registration feature