Merge pull request #332 from zanneth/master

Fixed numerous memory management issues and possible crashers.
Quick Fix for #332 (Hunging up on start up)
Fix for deadlock due to calling parseRcFile inside +instance singleton method
Merge pull request #338 from abigagli/master

Possible fix for deadlock @startup discussed in Merge pull request #332
Support Ctrl-W + 'h,j,k,l' (Issue #334)
This is easy implemantation.
Ctrl-W+j,l moves forcus to next editor area.
Ctrl-W+h,k moves forcus to previous editor area.
Made Ctrl-W + h,k,l,j behave more like vim. (#334)
Add window related features
Fix window operation documentation
Add primary XVim class hierarchy figure documents.
Merge pull request #344 from pebble8888/classdoc

Add primary XVim class hierarchy figure documents.