many changes
- removed bower_components from version control
- updated & moved ng-prettyjson.html into demo/ directory
- added .bowerrc to specify "lib" as bower directory
- added "lib" to .gitignore
- further split up ng-prettyjson.js for ease of unit testing
- better performance when making entities
- added tests for markup() and makeEntities() functions
- updated travis.yml to use grunt-cli
- updated Gruntfile.js to have "unit" and "continuous" targets for test; "unit" will run and watch for updates while "continuous" is best used by travis
- renamed MIT-LICENSE.txt to standard LICENSE
- updated test script of package.json to use Grunt

note: unless you want to run Karma directly by some other means, with grunt-karma the karma.conf.js file(s) are probably not needed.  I haven't removed them, because other IDEs (like JetBrains products) can run Karma directly if given a configuration file, but cannot do this w/ Grunt.