Add bootstrap-select dependency

- Font Size picker depends on 3rd party bootstrap-select plugin
Integrate font size picker into build process

- FIX: renamed all.min.js to all.min.css in the css-min task
- Adding the bootstrap font size picker jQuery plugin code
- Adding the Sass file
- Modified gulp script to configure font size picker into the build
- Adding built css and js files
E2E test integration for font size picker

- Fixed bug regarding deprecated default size param name in instantiation of bfhfontsizes, now is using correct param name "fontsize"
- Added e2e test HTML for font size picker
- Added e2e test JS file for applying casper tests to font size picker
Revised file names of font picker e2e tests
Remove unneccesary import in font size test file