Python 3 allowed (installation instructions)

I was able to install in Python 3.3, and there are Windows binary installers for 3.2 and 3.3, so I assume this is out of date.
make check for jumps in parallels and meridians stricter (issue #108)
fix detection of jumps in meridians and parallels
Merge pull request #109 from jswhit/master

fix issue #108
Merge pull request #106 from takluyver/patch-2

Python 3 allowed (installation instructions)
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