fix description of auth feature
moved nuget-commands to nuget-commands-1.4, renamed assembly (not completly finished)
introduces nuget extensions for NuGet 2.0+, compiled from same sources as extensions for 1.4 (for now)
log nuget version and commands version, polish tests
user NuGetSource, change xml command format, fix tests .NET ONLY
extract classes to standalone files
add macrodef for NuGet 2.0 and NuGet 1.4 plugins
cleanup code
polish code
switch to processor-style packages fetch, prepare for authentication
add HasCredentisals to NuGetSource
use same data format as in Java
hack NuGet feed credentials for list packages command
introduce data model interfaces
extract classes to files
report packages check errors for bulk operations
Merge branch 'nuget-auth-09.net' into nuget-auth-09-agent