Get rid of bundled magit

Change-Id: If7f95d80bc5af93c87be0bb24f26997986ecd539
Set up package.el, including marmalade

Change-Id: I4f7ff474408df2a30ce5e71fee4a7d707894cb32
Update gitignore

Change-Id: Iad10b4fa3b615d83b4204068d7a8107134a155e1