includes:
* <leader>ls dir files placed in vertically split window (also <leader>dir)
* <leader>rd search and replace down (in file)
* <leader>rg search and replace globally (in file)
* <leader>rr search and replace using ruby gsub (global search and replace)
Note: <leader>rf not used, ambiguous (replace forward or replace in file?)
* remove language and spelling american english, can't have a fixed default
* remove <CTRL>G (search and replace) binding
* remove <CTRL>F for fold file removed, use still available :F instead