ENH: Added StataReader and StataWriter (#1512)
[ENH] Added support for reading Stata formats 104, 105 and 108
Improvements to StataParser:
- Moved unit test data to tests/data
- Added unit testing for old Stata formats (SKIP per default)
- Use py3compat.PY3 instead of own implementation
Moved StataParser into new module pandas.io.stata
Fixed several problems in StataParser with Travis and Python2.
- Don't call encode/decode on python2
- Added .dta type to setup.py
- Fixed null byte
Added StataParser to release notes and updated io.rst
Merge branch 'master' of https://github.com/PKEuS/pandas into PKEuS-master

Conflicts:
	RELEASE.rst