Bug fixes/improved testing architecture in Memo.scala
Merge pull request #125 from Cazra/master

Memo.scala bug fixes/testing code improvements
Elision now has a crashinc() option that causes execution of a nested inc operation to stop all the way up to the root level instead of just skipping the bad inc'ed file. crashinc() is ON by default.
Merge pull request #126 from Cazra/master

crashinc option