Added ListCollection mpl example.
Added listcollection example and a first implemetation in mplsupport.
Making the example more PEP8 compatible.
Fixed the names of the spatial data fields, xs and ys.
Modified test example to simplify the test case.
Added support for widht, alpha, and coloring (at least one color now).
Fixed not working colors for each segment.
Added some comments about coloring input and minor fixes.
Refactoring of the cycle function to avoid code duplication.
Merge pull request #352 from damianavila/lines

[WIP] ListCollection mpl-support