Show file renames in diff stats

https://bugzilla.gnome.org/show_bug.cgi?id=720731
Merge branch 'feature/show-diff-renames' into t

Conflicts:
	libgitg/resources/diff-view-html-builder.js
Show anonymous avatar by default

https://bugzilla.gnome.org/show_bug.cgi?id=720734
Fix round corner on the right side
Merge branch 'feature/use-default-avatar' into t
Clean up code a bit
Rename to 'table_body'
Close '<tr>' tag properly
Use jQuery method like the rest
Use '<span>' instead '<div>'
Change to much suitable 'hunk_stats'
Rename 'filepath' to 'file_path'
Rename 'table_body' to 'file_body'
Rename 'stats' to 'file_stats'
Document the usage of each block of code
Apply 'pre-wrap' only on code
Remove obsolete css styles
Follow css selector convention
Put related styles together
Tidy the css styles a bit