Add `ag` mappings in vim
Add `ag` mappings in vim

https://robots.thoughtbot.com/faster-grepping-in-vim

- Create an `:Ag` command if none is defined.
- map `\` in normal mode to set up the command for an argument

bigbam505/dotfiles-work,YepengFan/dotfiles,voanhduy1512/dotfiles,astoellis/dotfiles,koerbcm/dotfiles,toobulkeh/dotfiles,T1D/dotfiles,rootulp/dotfiles,moofish32/dotfiles,mspringfield/dotfiles,ren/dotfiles,T1D/dotfiles,mspringfield/dotfiles,astoellis/dotfiles,turino/dotfiles,tsigo/dotfiles-thoughtbot,ransingh/dotfiles,ecnalyr/dotfiles,koerbcm/dotfiles,aliceyoung9/dotfiles,ren/dotfiles,koerbcm/dotfiles,YepengFan/dotfiles,Jiwoong/dotfiles,bschmoker/dotfiles,rootulp/dotfiles,bigbam505/dotfiles-work,ransingh/dotfiles,ZloeSabo/dotfiles,tchiarato/dotfiles,koerbcm/dotfiles,tchiarato/dotfiles,aliceyoung9/dotfiles,robkilby/dotfiles,voanhduy1512/dotfiles,ransingh/dotfiles,bschmoker/dotfiles,Jiwoong/dotfiles,moofish32/dotfiles,ZloeSabo/dotfiles,koerbcm/dotfiles