1) Fixing a bug in the constructor of the provided ExcelFile type that allows you to pass a file name.
2) Added a headerrow configuration parameter to the ExcelFile type provider. This allows you use an arbitrary row to generate the properties of the provided row type
3) Extracted some common logic in the ExcelProvider.fs file into functions
Merge branch 'master' of https://github.com/fsharp/fsharpx
Merge pull request #222 from JohnDoeKyrgyz/master

Fixes and enhancements to the Excel type provider
Merge branch 'master' of github.com:fsharp/fsharpx
Fixed missing FsUnit Package with NuGet
enabled NuGet packet restore
added test for AwaitObservable
AwaitObservable will now dispose it's subscription to the Observable if it's workflow is cancelled
Merge pull request #224 from CarstenKoenig/master

fixed a small bug with AwaitObservable
added maybe to prelude
Merge pull request #226 from CarstenKoenig/master

Haskell style maybe operator in prelude
Fixed merge error