Fixed: objj.vim is too old and has some bugs.

objj.vim cannot highlight much syntax correctly, and it should be updated. I've modified objc.vim to objj.vim which reads javascript.vim in the beginning, and now it looks good. Because javascript.vim & c.vim must be loaded into objj.vim, so they should also be committed.

Fixes #2211
Merge pull request #2214 from kevin-xu/kevin-xu-branch

Fixed: objj.vim is too old and has some bugs.