Use '.collapsable' instead of hard coded html tag
Click 'file_header' will toggle collapsing of the diff
Add 'Expand All' button
Make expander controlable
Collapse the diff by default
 Wrap the diffs in a table
Make sure the scrollbar is showed at the bottom
Add commiter info
Merge branch 'feature/commiter-information' into t
Merge branch 'feature/option-to-wrap-unwrap-code' into t

Conflicts:
	libgitg/resources/diff-view.css
Merge branch 'feature/add-collapse-all-button' into t

Conflicts:
	libgitg/resources/diff-view.css
	libgitg/resources/diff-view.html
	libgitg/resources/diff-view.js