Removed both Supertab and cppomnicomplete.

So, I'm going to be moving to using the YoucompleteMe plugin.
As part of this process I'm going to be removing my Supertab and
other .cpp omnicompletion settings. Hopefully, this ends up being
a useful choice. We shall see... Plus side of using a version control
system is that I can also roll back right?
Added the absurdity that is the YCM plugin.

I can already see it slowing down my typing. Maybe this
is a really stupid idea. We shall see.
Removed the supertab settings.

Since I'm no longer running supertab it makes sense to
remove it from play.
Started initial settings for YCM.

I like starting simple, so I think this will be where I start.