Updated JsonNet and pushed package version to 1.0.48.2

Updated JsonNet reference to 6.0.4 to get rid of 4.0.7 assembly reference
exception that occurred sometimes when using the JsonNetSerializer with
newer versions of JsonNet. Raised package version 4th digit to avoid
collision of this version with possible future package versions on the
Official NuGet Package Source. To deploy on internal NuGet server, add a
-Source parameter and API Key to "NuGet Publish.bat"
Merge branch 'master' of github.com:henrik-m/PlainElastic.Net

Conflicts:
	NuGet Publish.bat
	NuGet/plainelastic.net.nuspec