Add ascii_to_binary function in ace module.
Make sure first argument to struct.unpack is str, not unicode.
Added test_ace.py and ACE file for H-1.
Merge branch 'staging' into ace-conversion

Conflicts:
	pyne/ace.pyx
Merge branch 'staging' into ace-conversion
Fix integer division in ace.pyx.
Updated test_ace.py to download ACE file from TALYS rather than using an ACE
file within the repository.
Merge branch 'paulromano-ace-conversion' into staging