Create db migrations framework

Implement #798 Flexible ssh-key input

Fix #807 parse the userinfo with the golang tools

Fix in url if cache avatar is enabled

Allow start.sh from any working directory

This change to start.sh allows it to be executed from any working directory and always reference the gogs binary in the parent directory. Very helpful when calling start.sh from an init script.

Conflicts:
	.gopmfile

Change chardet to gogits

Translation update

Add max-width to commit message of repo-files-table

Fix link to user profile, update based on adjusted MentionPattern

It is now possible to input ssh keys in a number of formats: openssh, SSH2 or just the base64 encoded key.

Fix #799 by adding a tooltip for all dates in all settings/panels

Note, this is now only fixed with Go version >= 1.4.2, see this bug in Go: 07d86b1f2d

refs #763