Regenerate with SWIG 3.0.2

To avoid unrelated diffs in the next commit.
Simplify the quadopt module

Take "bez" string as input and output the optimized one, instead of
reading and writing files on the filesystem.
Add a fontcrunch.optimize() that uses quadopt
Removed unused code

This also removes the "plotting" functionality (and the sipro dependency
with it), not sure if it is still wanted, though.
Spiro is not used now
Merge pull request #3 from khaledhosny/master

Simplify the python code