Add skin.js from kama

Makes skin compatible with ck 4
s/.cke_skin_BootstrapCK-Skin /.cke/

ck 4 does not scope the editor with the skin name anymore
move toolbar rules into toolbar.css
check in structured CSS from kama skin

Will port over Ck styles to these respective files
Port rich combo styles over
Port over elements path styles
Port dialog styles for ck 4
more style fixes for ck 4
Add (some) famfamfam icons

The ones I care about :)
more style fixes
Adding build.sh script to build skin into ./build
Remove some legacy rules
Fix up IE style names
adding README to icons dir
move all skin code into src dir
remove generated icons.png
* Fix build script to work out of src dir
* update README to indicate CK version 4