Remove unnecessary fabricate imports.
Verify SHA1 checksum of downloaded fabricate.py, and support unsafe build script mode with unverified build support.
Check for existing local copy of Fabricate before downloading it.
Merge pull request #279 from kagu/verify_fabricate

Verify fabricate
make recording an experimental feature
Merge pull request #283 from cyberixae/make_record_experimental

make recording an experimental feature