Add ocaml and haskell modes
Add mu4e config
Remove TODO/FIXME/BUG highlighting and flymake config

The highlighting was too distracting and not useful.
flymake makes things sluggish.
Fix erlang mode when embedded in org-mode

projmake-mode breaks if given a buffer not attached to a real
file. Should see about patching it for that, but for now,
conditionally load projmake-mode. This is essentially only an issue
when editing code blocks within org-mode.
Load vendored org-mode in full