FIX: some parsing bugs
Merge branch 'master' of github.com:vispy/experimental

* 'master' of github.com:vispy/experimental:
  Added prototype of collection API.
  Updated MultiLineVisual experiment.
  Added dirty prototype of MultiLineVisual.
  Wrapping multi line example in a visual.
  Removed some transformations in gl-agg line experiment.
  Updated line example.
  Adding antialiased line experiment.
  Adding line test.