Added categorized icons, HTML attribute support, custom search values & themes

Following are the changes

* 1.  Icons can be grouped
 * 2.  Icons can be searched within groups
 * 3.  Icons can be set with custom html attribute (like data-attr)
 * 4.  The search values can be given diffently from the source, useful when using data-attr like icons
 * 5.  In case of select fields the search values are taken from the option labels
 * 6.  Custom theming support
 * 7.  Icons show titles (from source or searchValues)
 * 8.  Custom theming support
 * 			Added theme parameter which is applied as a class for the iconpicker
 * 9.  A new dark grey theme with rounded cornering and CSS3 design
 * 10. Modified setIcons API to pass a second parameter of search values

I've also bumped the version to 1.1.0.