Bugfix

Enhancements

• Update the readme fixing dead links
• Use new Travis CI containers for faster builds
• Add CI tests on Windows using Appveyor

Fixes

• Remove reference cycles from various objects to fix memory leaks.
• Add unittest that provides an API to test garbage collection.
• Fix the LUT manager to select the correct lut mode for QT backend
• Use the python-wxtool package to speed up Travis CI build
• Fix TVTK wrapper to allow look up with long keys for Points
• Fix glyph to handle the masking of input points
• Update the docs with known bugs, issues list and describe the PR workflow on github for development and documentation.
• Fix TVTK wrapper to update number of cells when a cell is inserted in a VTK cell array
• Fix VKTFileReader to update output when using standalone
• Fix the sdist command