ImageItem now has auto downsampling; seems to be working properly.
Still need auto clipping as well.
Catch OverflowError from Point.length()
No rendering of "Line style keyword arguments:"  list because of missing blank line and  mysterious unexpected identation error
In list tables "**Arguments**", "Arguments:"  changed to **Arguments:**
Bugfix: Malformed  tables.
Merge branch 'develop' of https://github.com/pyqtgraph/pyqtgraph into develop
Bugfix: Malformed  tables.
All argument lists with `**Arguments:**`
Merge remote-tracking branch 'remotes/upstream/develop' into develop
IDE files added to .gitignore
- Links in plot function added/resolved
   (PlotWidget.plot() can not resolved, maybe useless)

-Links in "Organization of Plotting Classes" added/resolved
   - GraphicsLayoutItem changed to GraphicsLayout
      (svg/png picture also)

  graphicswindow.rst now useless (no link)

  Yes it "makes" ....
  Renaming of GraphicsLayoutItem to GraphicsLayout
"Arguments" added again (copy/paste issue)
":" added again (copy/paste issue)
":" added
Minor Arguments list alignment in setDownSampling
malformed Signal list of class ROI
Aditional ":" added, minor list alignments
malformed Signal list of function setData
List  alignments class WidgetParameterItem
Update imageToArray to support Py2.6 + Qt 4.10