#55 Add a Compressed Json Serializer using the GZipStream

[fgideali]

PR for #55

[MichaCo]

I think for dnx451 and net45, you should not add .net core assemblies. Either the Compression stuff is already available, or you add them to frameworkAssemblies.

[MichaCo]

Thanks for the PR @fgideali, looks very good overall :)
Don't worry about the 2nd check which is failing, I'll take care of all that after a merge.

Could you take a look at the project.json references? I think it is wrong how it is setup right now.
And targeting .net core should work, too, I think

[fgideali]

Indeed, the System.IO.Compression dependency is only needed for the .net core
I fixed the project references.

Is there anything else I could do to prevent that fail on AppVeyor?

[MichaCo]

Thanks!
For the 2nd solution to build, the file needs to be added as reference to the old csproj.
But don't worry, I'll go through that when I merge the changes and create a new release.
Hopefully I find some time this weekend... ;)