Optional new feature allowing you to customize the current line number color (Thanks Mark)
To use open Tools->Options->Environment->Font and Colors and set the "Relative Number - Current Line" property.
Update 1.3.2:
Fix for views that do not support outlining (e.x. DIFF's) (Thanks Taylor)
Update 1.3.1:
Fixes an index error when a document only had the last line visible
Update 1.3:
Added support for VS2012 and VS2014
Display absolute line numbers for unfocused editor windows (Thanks Alex!)
Update 1.2:
Fixes zoom
Performance optimizations
Correctly handles mouse scrolling with folded code
Update 1.1:
Now replaces the built-in line numbers
Respects if you have line-numbers turned on/off (:set number, :set nonumber)