removed _build directory
fixed mulitindex bug introduced by new pandas version
updated to make a data folder if it does not exist
moved the tests to directory outside of the main package, updated
setup.py and manifest.in to reflect these changes. Also using pytest for
testing from now on.
moved tests
changed to include tests directory in distribution
pytest now used for testing
made pep8 compatible
force radians calculation to 64bit float
ISMN readers now read the new ISMN format, updated tests and test data
accordingly
bias does now also return a named tuple
updated info for v0.1.3