Add vim-signify; remove vim-gitgutter

References #488.
Need to disable indent guides auto colors. If not explicitly disabled the defined colors are always overridden.
add fullscreen mode for GVIM and Terminal
add bufferline, work well with airline
change airline theme, match with solarized theme
Merge pull request #498 from JoveYu/3.0

some useful configuration
Merge pull request #489 from mhinz/add-signify

Add vim-signify; remove vim-gitgutter
removed unused 'link'
adding vim-over
Adding vim-sneak
Merge pull request #493 from willdietrich/disable-auto-colors

Need to disable indent guides auto colors.
Fixed: vim-snippets URL does not exist

Point to https://github.com/spf13/snipmate-snippets instead
Merge pull request #507 from wari/patch-1

Fixed: vim-snippets URL does not exist
Add nmap <leader>sc :SessionClose<CR>
Merge branch '3.0' of github.com:spf13/spf13-vim into 3.0
Merge pull request #509 from johntyree/SessionClose

Add nmap <leader>sc :SessionClose<CR>
Merge remote-tracking branch 'upstream/3.0' into 3.0