Remove .bashrc.load.

I don't really use bash any more and all of my machines already have a
~/bin directory, so I don't see a need for it.
Merge the ~/bin directory instead of replacing it.

I often have a bunch of system specific odds and ends lying around in
~/bin, so I'd like to have .dotfiles/bin merge into it, not replace it.
Initial import of most important files.

Or at least the most important ones that happen to be on this machine at
the moment.