Creating Gaussian camera and camera CCD plot.

[mareuter]

• Adding Gaussian camera.
• Adding documentation to Gaussian camera class.
• Change in function name for Gaussian camera.
• Adding Camera Control widget.
• Adding CameraController.
• Adding pytest-mock requirement.
• Changing base widgets for plots.
• Adding pyqtgraph deps.
• Add pytest-mock to Travis YAML.
• First cut at camera plot integration.
• Switching to dedicated camera plot widget.
• Adding a status bar updater.
• Code style renormalization.
• Code renormalization.
• Documentation updates.
• More code style renormalization.
• Fixing about typo.