Moved all keybinding settings into g:SheldonPrepareBuffer() in sheldon.vim
The buffer name is now "~/SheldonBuffer" instead of "SheldonBuffer", which allows the command :Sheldon to switch to an existing SheldonBuffer, if one already exists. Also, added the command :SheldonRun .
Merge branch 'master' of https://github.com/engintoklu/sheldon.vim