Merge pull request #71 from VoiDeD/jit-spew

Only spew JIT compilation and opcodes when built with JIT_SPEW defined.
Merge pull request #61 from VoiDeD/ambuild-disable-auto-versioning

Add an ambuild configure option to disable auto versioning.
Add test.
Merge branch 'keyvalue-from-string' into master-voided
Merge remote-tracking branch 'origin/master' into master-voided