add reset button to google webfont select fields

also cleaned up the jquery for initializing and changing font select
fields; this fixed a problem i was seeing with the dummy text not
updating when multiple instances were loaded on the same page.
google font select update css styles and change css class names

made the css class names more unique by adding "redux" prefix. styled
the reset button to match the wordpress default ui crossed with the
existing font selector style.
google font selector: editable sample text and font size

changed the sample text to an editable text box and added the ability
to change the font size _appearance_ although this doesn't save as part
of the option at this time.
google font select: reset button resets the sample text font size
Merge branch 'master' of git://github.com/ghost1227/Redux-Framework
Merge pull request #111 from kaymmm/master

added reset for google webfont select fields to take care of issue #98