Add TabDefault and TabKernel vim commands

Add custom commands to vim, TabDefault and TabKernel. These commands reconfigure
the editor for kernel development, or back to defaults (probably for Ruby
development).

config/vimrc

@@ -16,8 +16,10 @@ set t_Co=256
 set autoindent
 set smartindent
 
-set tabstop=2
-set shiftwidth=2
+set tabstop=2 softtabstop=2 shiftwidth=2 expandtab
+" Might not need softtabstop=2 here
+command TabDefault set tabstop=2 softtabstop=2 shiftwidth=2 expandtab
+command TabKernel  set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab
 
 set showmatch
 set guioptions-=T
@@ -36,7 +38,6 @@ hi ColorColumn ctermbg=234
 set number
 
 filetype plugin indent on
-set expandtab
 
 " Shortcuts