Merge develop into master for release 0.11.0

PyQtGraph release 0.11.0rc0

PyQtGraph release 0.10.0

Merge tag 'pyqtgraph-0.9.10' into core

Conflicts:
	graphicsItems/ViewBox/ViewBox.py
	parametertree/SystemSolver.py
	widgets/SpinBox.py

PyQtGraph release 0.9.10

PyQtGraph release 0.9.9

Merge tag 'pyqtgraph-0.9.8' into pyqtgraph-core

Merge tag 'pyqtgraph-0.9.7' into pyqtgraph-core

Merge branch 'release-0.9.8'

Bugfixes:

  - ArrowItem auto range now works correctly
  - Dock drag/drop fixed on PySide
  - Made padding behavior consistent across ViewBox methods
  - Fixed MeshData / python2.6 incompatibility
  - Fixed ScatterPlotItem.setSize and .setPointData
  - Workaround for PySide bug; GradientEditor fixed
  - Prefer initially selecting PlotItem rather then ViewBox when exporting
  - Fixed python3 import error with flowcharts

Cleaned up examples, made code editable from example loader
Minor documentation updates