Always use full path in build script
Always use full path in build script

The problem is that the F# Formatting evaluator messes up `System.Environment.CurrentDirectory`,
so relative paths stop working when processing FSX files :-(. (This should be fixed in F# Formatting,
but it is probably safer to use full path anyway.)

jeremyabbott/Presentations,bigjonroberts/Intro-To-Kanban,koenmetsu/presentations,koenmetsu/presentations,jeremyabbott/Presentations,FSharpBristol/FSharpBristolPresentations