Rewrited and async
Merge branch 'master' of github.com:vad3x/postageapp-net

Conflicts:
	.gitignore
	TWG.PostageApp.Net35/Properties/AssemblyInfo.cs
	TWG.PostageApp.Net35/TWG.PostageApp.Net35.csproj
	TWG.PostageApp.Net45.Tests/TWG.PostageApp.Net45.Tests.csproj
	Tests/ClientTest.cs