Added classes to parse USX data into blocks and serialize results to XML.
Merge branch 'master' of https://github.com/sillsdev/ProtoscriptGenerator

Conflicts:
	ProtoScript/ProtoScript.csproj
	ProtoScriptTests/ProtoScriptTests.csproj
Merge branch 'master' of https://github.com/sillsdev/ProtoscriptGenerator