Remove jQuery UI widget features

Now is only a jQuery plugin.
Rename source file to remove the ui mark
Remove every UI reference, and adapt the code to a jQuery plugin
Update readme due to bootstrap oriented changes
Adapt the main test to the new plugin
Use different colors in the progress bar
Some bugfixes
Bugfix showing verdicts
Update "rules" to use the bootstrap version
Add requirements to the README
Support custom viewports for progress bar, verdicts and errors
Update readme with the new 'viewports' option
Fixing initialising multiple meters on sigle page
Merge pull request #1 from Skakruk/patch-1

Fixing initialising multiple meters on sigle page
Support several strength meters in the same page
Update pwstrength.js

Updated for Bootstrap 3.
Add bootstrap 3 support without losing bootstrap 2

Add new option to activate the bootstrap 3 support
Update bootstrap versions in readme
Add jQuery plugins registry json
Don't show password strength verdicts initially. You can change this
behaviour by showVerdictsInitially option.