fixing issues with georeferencing
initial version of graph feature
implemented curved lines
pass mousewheel event through the map
Fixing map.gcsToDisplay
Merge pull request #85 from OpenGeoscience/handle-mousewheel

Pass mousewheel event through the map
Creating Shapefile reader example in testing
Make all sizes set explicitly by resize
Merge pull request #84 from OpenGeoscience/graph-feature

Implemented graphFeature
Merge pull request #88 from OpenGeoscience/fix-gcsToDisplay

Fixing map.gcsToDisplay
making layer sizes public
removing old code from map interactor
renaming m_updateRenderParams to updateRenderParams
Add support to share a single GL context between layers

Share a single viewer between all vglRenderer instances so they
can share the same GL canvas.
Move VGL submodule forward
Merge pull request #89 from OpenGeoscience/fix-resize

Make all sizes set explicitly by the map resize method
refactoring phantomjs unit tests
Only register events for base layer
support python 3 for test runner
Fix style issues