Extracted "load all files from the given directory" functionality to a
small helper function.
Added exec-path-from-shell package for Mac env; PATH in emacs with match
PATH value in the normal shell session.
Added helm-ag-r packge; helm interface for the SilverSearcher.
Added local directory for system-specific configuration to be loaded
after all packages.
Merge branch 'master' of https://github.com/bkon/dotemacs

Conflicts:
        init.el