Gitlab moved to mysql

Removed hardcoded SSH Username on project create/edit form. Fixes Issue #493

Adapt to new web_hook_data method. fixes #509

Uses the first key that the user has for testing post receive hook.

Merge branch 'fix/web_hook_content_type' of https://github.com/kleinmann/gitlabhq into kleinmann-fix/web_hook_content_type

Merge branch 'deploy_keys_nonunique' of https://github.com/miks/gitlabhq into miks-deploy_keys_nonunique

Added/fixed specs
Update spec/factory to allow Factory#new without opts

Conflicts:
	app/models/key.rb

Generate consistent gravatar hash values as per documentation.