Require Karma

• configured the jasmine tests to work with requirejs under Karma test driver
• fixed code for all possible JSHint recommendations gathered via [karma-jshint]
• fix travis ci build badge to point to 0-1-stable branch (so it never appears broken on npmjs.org)
• + new: code coverage via coveralls.io
• + new: public code climate info
• + new: measurement.js exposes AMD (i.e. requirejs) and CommonJS features