using fake boot & latest intellifactory.build

Hi, I upgraded the project to my latest build tools.

Please have a look. After the initial build with Build.cmd, try building further with `fake` or `fake boot conf` when you need to re-configure dependencies.

Pros:
  XML/batch boilerplate is autogenerated. 
  No more hard-coded version numbers for packages
  if.build API handles matrix builds

Cons/TODO:

  There is still too much redundancy in the F# build code - need to abstract away, add 
more helpers to FAKE and/or if.build

  Tests currently fail because of missing redirect to F# 4.3.0.0. Should figure that one out.

. --A