add failing , ; (comma semicolon) tests for t and T
implement , ' (comma semicolon) for t and T
Modify #664 pull request a little(implemented differently).
Fix #662
Update README.md
Merge branch 'master' into develop

* master:
  Update README.md
Add extremely partial 'execute' and 'echo' feature

Conflicts:
	XVim.xcodeproj/project.pbxproj
	XVim/XVimExCommand.m

Conflicts:
	XVim.xcodeproj/project.pbxproj
h,l,b,e,w,cw,dw,dl,x understanding placeholders
remove debug log noise
comment out unused methods
add file,line info to XVimTestCase
Fix hide/show scrollbars for guioptions
Add features C-w o
make test easier
Fix bug #573
add read DVTPluginCompativilityUUID command to Rakefile
suppress warning
Support C-w_w, C-w_h, C-w_l in version comparison window
Add jumplist feature