added init.fsx to generate build.fsx from template

the build.template file is a tokenized version of build.fsx

this pull request is NOT done, just want to get the ball rolling here

this is pursuant to #22 
My reading of the [FAKE docs](http://fsharp.github.io/FAKE/commandline.html) suggests that the bit after --fsiargs and before the build script nomination is passed to fsi and the stuff after is passed to the script. My understanding is that the $@ was included to allow build.fsx to be parameterized.