Issue #10: More lenient treatment of entries.timings.receive

Add an accessor with the default value 0
Merge pull request #11 from possiblywrong/issue-10

Issue #10: More lenient treatment of entries.timings.receive
Adding GPL v2 to be compatible with chrome/webkit css

GPL v2 the css in the /chrome directory is from the webkit project. This should be a compatible license.
Fixing #8 - Adding missing drag-enter and drag-over events
Fixed #13 - Updating libs, using bower
Addition to #13 - removing non bower libs
Removing 404 file
Updating Gruntfile and package.json
Removing unused images
Fixed #14 - Fixing safari bug