Catch OverflowError from Point.length()
Checking if view is alive before returning it.
Make sure we don't leave view boxes alive by doing a 'bridge' for the on the plot items. Also added warnings if proper cleanup wasn't done.
PlotItem.showValues fixed (was not implemented before).
Fixes calculation of axis width/height in case values are not shown.
Added check for zero ViewBox width when calculating automatic downsampling ratio. (Prevents zero-division when downsampling is set before Plot is properly created and drawn within a container).
Merge pull request #58 from JNevrly/plotdataitem_downsampling_fix

PlotDataItem downsampling calculation fix
Disable weave by default.
Minor corrections to debug.Profiler
corrected SVG test, moved to its proper home
Cleanup / fixes:
  - Corrected isQObjectAlive for PyQt and older PySide
  - Warning messages are opt-in using pg.setConfigOptions(crashWarning=True)
Fixes to make crashing less likely on PySide

Merge branch 'clear_cycles' into develop
GraphicsItem.getViewWidget() returns None if widget has been deleted by Qt
Merge remote-tracking branch 'fabioz/fix_widget_dead' into develop
Fix ROI.sigRemoveClicked to avoid repeated signal emission
Update ROI example to demonstrate removal
Fixed Parameter.sigValueChanging
Fix for colorama bug:
https://code.google.com/p/colorama/issues/detail?id=47
Merge branch 'showValues_fix' of https://github.com/JNevrly/pyqtgraph into JNevrly-showValues_fix
Style changes and a minor bug fix
Fixed AxisItem.__init__(showValues=False)
Merge branch 'JNevrly-showValues_fix' into develop
py3 fix for parametertree example