Add classifiers to setup.py

Mark as python 3.3 compatible, since that was merged.
Add license to setup.py.
Version bump
Fix classifiers for PyPI
Update to LZ4 r119
Closes #23, closes #24
Update CFLAGS for build
Closes #8, closes #18
Fix indentation, style
Use LZ4_decompress_safe
Yes, sometimes the output can be bigger than the input is the entropy is very
high.
Include stdint.h
Closes #21
Bump to 0.7.0