Revert "Update powerline config"

This reverts commit a091214d5789bce66df7ca0a10c485fcda11e9f3.
Revert "Powerline: Solarized Light as Vim's default color scheme"

This reverts commit d0becf2e6094ea34e84a880dcd0d1736bbe75509.
Revert "Powerline: Deployment of Vim"

This reverts commit 67f7f1d4edd3ae4a3aaef7997df7d18f24e63bc1.
Vim: Plug-in: vim-airline
Vim: some configs for airline
Support Powerline's font