Changing to sRGB color profile*, masking emblem group

- * http://developer.apple.com/library/mac/#documentation/userexperience/conceptual/applehiguidelines/IconsImages/IconsImages.html
- making subtle improvements to 32x32/16x16@2x icons
- adding a few more file emblems
Ignore todo list
Update PSD template
Add Sketch template
Update readme