A refresh of vimrc

Upgrade to latest Vundle.

Reinstall most of the plugins.

Tagbar has a performance issue so use the old one.

QFixToggle has a bug so use the old one.

Other old plugins are moved to bundle-old.

Also introduce a few new modules, such as airline and matchit.

Signed-off-by: Fam Zheng <famz@redhat.com>