Fix for: Basic support for :set statusline #1350

Hi Jared,

please review my fix. 

I add 2 new settings: 
* set laststatus=[Number] - 0 means off and some other value means on.
* set statusline=[Message] - Message will be, as it is, showed.  
If you find a solution for this then there are an another similar issue:
* Open 2 files
* press i
* switch to the second file

=> In Vim: you are in insert mode
=> in VsVim: you are in normal mode