* Fix issue link rendering in commit messages

* Update page.tmpl

* No links for parens

* remove comment

* add external markup render support

* bug fixed

* refacotr codes and fix wrong error log

* fix comments and add check to prevent leaks

* add check for config file and improve the example

* check file close error

* use ioutil.TempFile instead uuid

* correct Render -> Parser

* improve warning when incorrect markup setting

* fix typos

* add init support of orgmode document type on file view and readme

* fix imports

* fix imports and readmeExist

* fix imports order

* fix format

* remove unnecessary convert

* restructure markup & markdown to prepare for multiple markup languages support

* adjust some functions between markdown and markup

* fix tests

* improve the comments

* markup: microoptimise for many short filenames in directory

Move strings.ToLower() after the early-return length check. This is a safe operation in all cases and should slightly improve directory listing performance when a directory contains many thousands of files with short filenames.

* markup: expand test cases for IsReadmeFile()

* fix multiple readme file rendering and fix #1657

* remove unnecessary loop