fix ctrlp working_path_mode
Use elzr/vim-json instead leshill/vim-json

leshill/vim-json will NOT be updated anymore, again.
Merge pull request #365 from JoveYu/3.0

fix ctrlp working_path_mode
Merge pull request #367 from perfectworks/3.0

Use elzr/vim-json instead leshill/vim-json
Merge remote-tracking branch 'spf13-vim/3.0' into 3.0
update some custom-setting to .vimrc.fork, instead of .vimrc.local.