update use of PyQt as matplotlib backend #217
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Attempt to solve Issue #216
Notice that PyQt4 is no longer is the standard backend, but what ever matplotlib imports: in order to force matplotlib the use of a specific Qt binding, either import that binding first, or set the QT_API environment variable.
I have not tested this, as my computer is not corrected configured. Please test it before accepting the PR.
It would also be nice to test in an older matplotlib version, as I could not find any documentation prior to 2.0. I changed the minimum requirement in README just in case.