fix tests
Add information about the contributing process
Merge pull request #4710 from gitlabhq/contributing_guide

Add guidelines for the Contributing Process in PROCESS.md
Fix wiki popup for new page
Increase input padding. Minor ui fixes
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Create a wiki when wiki_enabled:true

Change-Id: I4fa8f20647b7f0151da811b77b378e3de8453e43