Merge pull request #13 from leonardt/specializer_specific_config

Specializer specific config.
Merge pull request #14 from leonardt/pybasicconversions-patch1

Adding a default Assign node handler to PyBasicConversions.
Move PRESERVE_SRC_DIR back to jit section of cfg.
Merge pull request #16 from leonardt/config-patch

Move PRESERVE_SRC_DIR back to jit section of cfg.
Merge remote-tracking branch 'remotes/upstream/master' into loop_unrolling
Adding support for LtE, more tests.