Fix setup.py to install euclid.py

[franzlst]

Installing this package with setuptools leaves out euclid.py. Thus after the installation, you cannot do import euclid. This is due to an erroneous setup.py which is fixed in this PR. The solution came from: http://www.agapow.net/programming/python/setuptools-and-the-single-file/

[codecov-io]

Current coverage is 54.67% (diff: 100%)

Merging #12 into master will not change coverage

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[ezag]

@franzlst thank you!