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)
Merge commit '87ecd' into refactoring

* commit '87ecd':
  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.

Conflicts:
	XVim/XVimWindow.h
	XVim/XVimWindow.m
	XVim/XVimWindowEvaluator.m
Merge commit '1ad53' into refactoring

* commit '1ad53':
  Made Ctrl-W + h,k,l,j behave more like vim. (#334)

Conflicts:
	XVim.xcodeproj/project.pbxproj
	XVim/XVimSourceView.m
	XVim/XVimWindowEvaluator.m