Segment docs and display
Added segmentation display mode (F3)
Fixes
Numpy type change and docstring
Fixes
Merge pull request #17 from holtzhau/segdisplay

Display segmented image
Add Travis-CI support
Add Python3 compatibility
Add headless display and further dependencies
Add basic GUI instantiation test
Revert to matplotlib 1.3 since 1.4 installs are currently broken
Differentiate installs based on Python version
Update if-else syntax
Relax Matplotlib version requirement
Only test under Py2 for now since opencv is missing on 3
Add forgotten comma
Allow use of system Python packages
Update API in tests
Merge pull request #12 from stefanv/travis-ci

WIP: Add Travis-CI support
Merge upstream/master