Profile259 build

[mcaple]

Michael,
I would really like to try out your package in a Visual Studio 2015 Shared Portable Library but cannot install it because it does not contain a target for '.NETPortable, Version=4.5, Profile=Profile259'. Did not really want to attempt a pull request for this as I have not done this before but do you think you could rebuild the package to target this version of the framework.

Thanks in advance,

Mark