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This requires an API change:
 - AxisItem.setScale(float) has the usual behavior
 - AxisItem.setScale(None) is no longer allowed. Instead use:
 - AxisItem.enableAutoSIPrefix(bool) to enable/disable SI prefix scaling
Also makes the API more intuitive since these features are now accessed and implemented independently.

AxisItem correctly handles scaling with values that are not power of 10
Can remove items from legend
updated plotItem setLogMode to allow unspecified axes

  - better handling of tick text / label area
  - ability to truncate axis lines at the last tick

Added MultiplePlotAxes example

  - AxisItem did not update grid line length when plot stretches
  - Workaround for PySide/QByteArray memory leak

added method for setting axis tick font

Fixed linearRegionItem hilight when not movable

 - fixed example testing script
 - Added finer axis ticks back in some instances
 - fixed improper bounds caching in log/fft mode
 - fixed exception handling in remoteproxy

  - AxisItem shows 2 tick levels instead of 3
  - Lots of boundingRect and dataBounds caching
    (improves ViewBox auto-range performance, especially with multiple plots)
  - GraphicsScene avoids testing for hover intersections with non-hoverable items
    (much less slowdown when moving mouse over plots)
These are deep changes; need good testing before we release them.

Started new SVG exporter
Merged updates from ACQ4

    Fixed exporters to automatically add filename extension.
    Fixed ViewBox 'auto pan' option.
- Other minor edits.

  - fixed handling of foreground colors in AxisItem
  - fixed rare crash caused in AxisItem 
  - fixed improper propagation of key events from SpinBox
  - many others

  - Fixed some floating-point precision issues. (Added a workaround for QTransform.inverted() bug)
  - No longer putting asUnicode inside __builtin__ since this causes problems in some rare circumstances
    (pyshell, lazy import recipe)
  - Minor docstring updates

- AxisItem.setScale(1) works properly to disable auto-value-scaling
- OpenGL fixes (stack overflow when drawing items, improper call to glPopAttrib)

- Text spacing fix for AxisItem

- workaround for PySide exit crash
- fixed alpha of major/minor grid lines

Bugfix -- AxisItem enforces tick boundaries more strictly

- Added pyqtgraph.systemInfo() for bug reporting
- GraphicsLayout does a better job of avoiding occupied cells when using automatic placement
- Fixed sizing issues with LabelItem
- Updated GraphicsLayout example

   - fixed AxisItem sometimes drawing the same tick twice (sometimes with different text)
   - fixed handling of record arrays in setting ScatterPlotItem point data

  - isocurveitem documentation
  - updates to GradientEditor and PlotItem docs
  - Fix for Canvas handling of item Z-position

Also cleaned up some context menu items

 - Made more extensible by breaking out tick spacing and text generating into separate methods
 - Text now tries harder to avoid overlapping

  - curves enable antialiasing when exporting to image
  - plotitems hide button during export

documentation update
removed documentation builds from repo.

Fixed a few bugs in AxisItem

 - volumetric rendering
 - isosurfaces, mesh rendering
 - basic transformation and parent/child functionality