adding codemirror v.3.12.0

Source: http://codemirror.net/
Minified with uglifyjs
codemirror v.3.12.0

Added codemirror.css v.3.12.0
Source: http://codemirror.net/
Revert "adding codemirror v.3.12.0"

This reverts commit 5c89bc9845cfae4042ea893fdec628d055ac9d9d.
Revert "codemirror v.3.12.0"

This reverts commit fff75be578c492a2aae99881b1dd81e4b5590fca.
adding codemirror v.3.12.0

Source: http://codemirror.net/
Minified with: uglifyjs
Merge pull request #1226 from AlexLibs/master

adding codemirror v.3.12.0