add plugin to switch to last tab
refresh bundles [automated]: https://github.com/scrooloose/syntastic.git @ 190d9f5e95e31dbdee1e2721f5d36d4d5c834dc7
refresh bundles [automated]: https://github.com/ervandew/supertab @ 40712ea8f4b5c5a4e5d3b1518e742ea19669fa23
refresh bundles [automated]: https://github.com/luochen1990/rainbow @ 695eb22e53dec40f26a767c1beb3623b098d82a9