Made tab complete sourcing to be more aggressive.

I did this just to try a more aggressive sourcing and see if it helping ease
development.
Added a bunch color schemes.
Setup silver searcher as my primary searching tool.
More fun with color schemes.
Added nicer sys clipboard pasting.

I added this little snippet to make pasting from the system clipboard easier.
It makes it so I no longer have to set paste, set nopaste manually. It also
makes sure that the code is pasted at the proper indention level initially.