WIP : draft of generic QT widgets
WIP : very rough draft of several widgets
Test 1d plotting widget
BUG: Fixed problem with not displaying 1-D widget
Merge pull request #1 from ericdill/1dtest

Fix display error
Merge branch 'widget_dev' of https://github.com/tacaswell/vistools into proto-1d
Need common.py from Caswell's widget_dev branch
MNT: Moved mixins class to earlier in the file because an earlier class didn't know about it yet
ENH: Big update to 1d plot widget. Added spinboxes to control x and y offsets, but they aren't updating the widget.  Made the test data be a set of sine curves with a phase shift and vertical offset
ENH: Significant update. Spinboxes for real-time stackplot shifting were implemented. Step size input for shift spinboxes added. Checkbox to enable/disable axis autoscaling added.
DEV: Added colormap keys to common.py.  Implemented colormap in 1-D stackplot viewer
MNT: Changed default plotting color
DOC: Added documentation to __init__ method of the view object. Renamed y data variable in __init__ method.
DEV: Added buttons for adding/removing test data from plot
MNT: Renamed classes
DEV: New capability; add data to a specific line
DOC: Added PlotWidget docstring
DOC: Updated documentation
MNT: Refactored 1d plot widget to abstract common functionality up a layer or three
MNT/DOC: Light changes related to refactor/commenting
MNT: Moved replot stub to the top level AbstractDataView class