Install missing packages at startup.
Set up zenburn with melpa
Removed support for auto-complete-auctex
Updated list packages to install
I wasn't using ac-org. Deleted it.
unnecessary lines if paredit is installed via melpa
Lines not necessary (ESS now loaded from melpa)
I don't use  abbrev
Package management config separate file.
I haven't be using mobile-org lately
~/elisp/bin is no more in the path.
gnu packaged not required
only melpa repo for package management
Merge branch 'pack-management'