#37 initial task computation builder
#37 parameterized TaskCreationOptions, TaskContinuationOptions, TaskScheduler
mapWithOptions, minor changes
avoiding building Task module for .net 3.5
Renamed Task.fromAsync to Async.toTask.
Added Task.toAsync.
renamed Task suffix to Async
Changed http request to file reading.
Fixed unwanted starting of Task in computation expressions.
removed Async.toTask, it was starting the Task anyway
Task.run and cancelation
changed Delay
didn't like the example
fschecking 'run o delay o const = id' law (from http://www.cl.cam.ac.uk/~tp322/papers/notations.html)
while and for
Corrected Outputting of date string

Added tests for round-tripping dates from provided types.
Merge remote-tracking branch 'upstream/master'
Merge pull request #163 from Massif/master

Improved round-tripping of dates
Copied Linq quotation compatibility from https://raw.github.com/fsharp/powerpack/master/src/FSharp.PowerPack.Linq
Putting Linq quotation compatibility into FSharpx.Linq
Adding a helper for Linq Lamba Expressions with 1 parameter
Revert "Corrected Outputting of date string"

This reverts commit 2e465a4e9b452fca44607d4e8e1a2dfd4e81d912.