changes for use with python3: used 2to3 for OsmApi.py and setup.py
Split tests in files and add NodeCreate test
Alternative test for assertRaisesRegexp for Python 2.6
Fix test for Python 2.6
bugfix by didier2020 (https://github.com/metaodi/osmapi/issues/10), not line 516 yet
added attribution to metaodi, description (python 3)
merged with metaodi/osmapi/tests