Fix the build's test run by changing the Tests project into a console application with assembly binding redirects.
Use the FSharp.Core.3 package to include FSharp.Core
Remove README from docs/output
Merge System.Net.Http.fs into Frank.fs

Very few pieces remain after you consider F#x is already included and
provides extensions to async computations that bind to Task types. Several
were already repeated in Frank. Lastly, since this is once again delivered
as an assembly, the split doesn't make a lot of sense.