implemented caching for C files and sideloading
moved hashing to ctree.nodes.File from ctree.c.nodes.CFile. Fixed empty to gen with the proper path and name.
Update defaults.cfg

Added Compile path to jit.
got transform skipping to work. Appears to be significant speed improvements
Merge branch 'caching-development' of https://github.com/ucb-sejits/ctree into caching-development