Added off and on images to background instead of self.

This way the images will also be rounded.
Merge pull request #13 from ric2z/master

Added off and on images to background instead of self.
Performance fix for knob shadow to draw on a bezierpath
Merge pull request #15 from gavinbunney/master

Performance fix for knob shadow to draw on a bezierpath
test html readme
delete html readme
Include bitcoin donation in readme
Added labels for the on/off states
update readme
Merge pull request #17 from andreamazz/master

Added labels for the on/off states
+ thumbimage
+ autoresizing
Merge pull request #19 from jhabr/master

Add option for thumb image
Add support for onThumbTintColor
Update onThumbTintColor as well if it was not specified
replace offText and onText with labels instead

This makes the code a bit cleaner and still gives access to font, color
and alignment.
update readme
Merge pull request #20 from chingjun/master

Add onThumbTintColor
Merge branch 'upstream-master'