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 
Could probably get rid of the preprocessor statement and reintroduce "not mono"

Something like:
=?> ("SourceLink", (not isMono) && (Pdbstr.tryFind().IsSome) )