New features and design update.

Added support for multiple viewport sizes per-task, and support for
media print/handheld testing. Tests coverage feature. Changed layout of
report.
Moved phantom browser resizing to run.js.
Fix for displaying empty task path.
Report changes.

Added mouse click navigation between images. Changed percent to be
showing level of similarity instead of difference. Added support for
breaking ajax requests to load different images.
Modified .gitignore to incorporate output and implementation-specific files
Merge branch 'master' of github.com:Schibsted-Tech-Polska/stp.pediff
Report update. Generate low weight previews.

Force pediff to wait for 500ms before saving - fixed lots of false
positives. Added generating .jpg files after .png comparison to lower
the necessary bandwidth. Included the above in report.
Renamed sample routes file.
Tweaked compression of previews
Added routes.json to gitignore
Extended arrow keys support. Download link for .png files.

Up/down arrow keys with pressed ctrl allow for task selection.
Added logo and help modal.
Capture whole page height. Update logo. Remove unnecessary file.
Support for files with different height.

Comparing screenshots with different height was causing a crash, thus
images height is now compared and when necessary the smaller image is
padded.
Updated readme file
Changed preview quality
Merge branch 'master' of github.com:Schibsted-Tech-Polska/stp.pediff
Documentation update.

Added coverage section to readme. Fixes some small errors in docs. Fixed
a bug in report layout. Updated coverage Route prototype for easier
extending.
Update bootstrap layout panels markup
Changes to report, html debugging, junit report.

Tasks in report are now listed based on configuration files, and are
separated into modules with actions (like click, keypress, etc.). This
allows for detection of failed tasks (timeout exceeded). Html for every
screenshot is now saved in environment/html/... for debugging purposes.
I've also added optional generation of junit-like report for cool
jenkins graphs :).