Merge pull request #3 from ashamis/master

Change when relative and absolute numbers are displayed
Added support for Vs2012

Also right align unfocused absolute line numbers
Fix for when document last line visible

When only the last line is visible and the document goes out of focus
it caused an index error.
Increment version number
Add null check for outliningManager

There are some views that do not support outlining, and so the
outliningManager injected into RelativeNumber will be null.  An instance
of where this fails (with a NullReferenceException) is trying to do a
diff on a change in git.
Merge pull request #5 from twsouthwick/master

Add null check for outliningManager
fixed index of counter