Update CONTRIBUTING.md

Added instructions for installing grunt.
Update CONTRIBUTING.md
Update CONTRIBUTING.md

Added closing "that's all folks".
Added support for 'copyClasses' option

Added support for the new 'copyClasses' option.  This option allows a
user to specify if they would like the native select box class(s) to be
copied over to the drop down container (which holds both the drop down
button and drop down list) (with value 'container') or the drop down
button (with the default value 'button').  The option also takes the
value 'none' to indicate that native classes should not be copied to
the SelectBoxIt object.
Fixed a lint error :(
Refactoring 'copyClasses' implementation

Took Greg's advice and used a if/then/else rather than a switch.  Also
changed so that unknown values do nothing, rather than copying classes
to button.
Added release entry for new 'copyClasses' option.

Also added myself as a contributor.  Yay me!
Fixed a lint issue
Changed styling for options list

Now it is defined to be at least 100% of the width of the button.
References #123 - Refactored copyClasses logic, added nativeMouseDown option, and added the customShowHideEvent option
References #123 - Fixed dynamic positioning bug
References #123 - Twitter Bootstrap box-shadow bug
References #123 - Updated mobile styles by updating margin and padding of the original select box and adding the -webkit-appearance property
References #125, #123 - Updates the Refresh() method
References #123 - Made the open and close methods compatible for mobile devices
References #123 - Cleaned up open/close logic
Officially releasing SelectBoxIt v3.2.0