Update skin for CKEditor 4.x

This set of commits get this skin to work with CKEditor 4.x skin API. There are a couple of notes below to consider before merging this branch.

### NOTES

1. Icons, I only ported over the famfamfam icons that I needed for my project (not many). This was a tedious process and I am sure somebody else has already done it. Basically all the famfamfam icons need to be copied over into the ./src/icons dir and named properly for CKEditor. I tried to find a famfamfam to CKEditor mapping file so I could automate that process, but I failed to find anything like that. How did the original author handle this?
2. A lot of CSS rules ended up getting removed because they were obsolete with this version of CKEditor. I tried by best to make sure nothing broke as a result, but I am not 100% positive.
3. IE testing I only tested this out later versions of IE 9+
4. restructured the code and added a build script. Make this a source distribution and added a shell script to build the actual skin that can be used.