Fix nuget download on Linux
Ignore .userprefs file
Update to Analytics.NET version 2.0

- use nuget package for Analytics
- update to modified Analytics API
Update .nuspec file

- update nuget package to 1.0 to match assembly version
- add dependency on Analytics nuget package
- add .nuspec and ReadMe.md files to solution
- increase assembly version
Merge branch 'Analytics_v2' of https://github.com/ermshiperete/DesktopAnalytics.net into ermshiperete-Analtyics_v2

Conflicts:
	src/DesktopAnalytics/Analytics.cs
	src/SampleApp/packages.config