4-ADD: plugins, MODIFY: vimrc/gvimrc

Add plugins:
* PHPDocumentor

Modify:
* Map PhpDoc() function to CTRL-p in modes; inoremap, nnoremap, vnoremap
* Set mapleader to "," and maplocalleader ",,"
* Map NERDTreeToggle to <leader>n
* Map vimrc quick edit to <leader>ev
* Map source cmd for vimrc <leader>sv