Revert "Try out the startify plugin"

This reverts commit ff964b7739c161eaf5d806f021e5aec37898ffab.

Nifty, but it doesn't seem like it fits my workflow.
Remove startify settings
Fix xruntime github url
Remove auto-renaming of ruby classes

Seems to be glitchy and not as useful as I expected. Maybe I can do
something better with onchange.vim.