node <= 0.xx doesn't support es6 syntax

ref: http://node.green/

In order to use es6 in the package we need a module bundler (webpack)
that transpile our code using babel.
To do that we did:
- added bumped to manage releases
- updated travis test
- updated package.json and bower.json in order to work with webpack
- added a CHANGELOG page
- updated index.html
- added many fix on module
- added eslint and remove jsonhint
- removed bower dependency
- updated documentation
- added automatic gh-pages deploy
- added angularjs and pdfjs as peerDependencies

aside note of duplicated dependencies in package.json:
angularjs and pdfjs are in both list because we need to alert user
if they lack AND for developing/testig purposes

ref: sayanee#90

Generate code coverage using Istanbul