include xml doxumentaion in nuget

include xml documentation in nuget

released nuget 2.4.3

nuget 2.4.2 release

added nuget 2.4.1

added nuget 2.4.0

Merge pull request svg-net#267 from vvvv/revert-198-master

Revert "Fix svg-net#176: Blurry text when overlapped with colored background"

Merge pull request svg-net#251 from sovietmagic/master

SvgPointCollection ToString method fix

nuget packaging now uses nuproj

updated version to 1.7