Finished backbone for coverage comparison

Directory listing and coverage percentages/data for
two builds are now displayed on the comparison page
Added coverage comparison to compare page

Coverage Difference column now displays coverage
increase/decrease between builds. Directories
that do not have coverage data for both builds
are not displayed.
Report page now has a form/link for build comparison

Builds are inputted via drop down menus and submitted via
the Compare button on the Report page
Merge pull request #31 from mvankeulen94/add-bootstrap

Added build comparison