Created tests and refactored some code along the way

Added stat graph util spec, refactored code

finsihed up tests and refactors

finsihed up tests and refactors

This commit fixes the regression caused by using a newer version of Grape and Grape entity.  This solves Issue 4023.

There are occasions where minitest is not bundled in packaged
versions of ruby that some OSes distribute (eg Fedora). Adding
minitest to Gemfile ensures that it gets loaded and tests can run.

Signed-off-by: Axilleas Pipinellis <axilleas@archlinux.gr>

update jquery-atwho-rails to v0.3.0

add autocomplete_source action to project for gfm autocomplete

move init_autocomplete layout from head_panel to project_resource

Prevent gollum to overrride gitlab-grit gem. Use grit as instead so gollum uses it too. Fixes things with gpg singatured commits, etc.

This reverts commit 4524ba20.