Changed FiniteCache which had a bug where calling items() would make it recurse forever with a new LRUCache implementation.

Merge remote-tracking branch 'termim/develop' into develop

Conflicts:
	pyqtgraph/graphicsItems/ROI.py

update contributors list

Conflicts:
	pyqtgraph/graphicsItems/AxisItem.py
	pyqtgraph/graphicsItems/PlotDataItem.py
	pyqtgraph/graphicsItems/ROI.py

This happens during debugging session in an IDE (eric5) when debugger inspects
variables but self._scenePos is not yet initialized.

  - Reduces aliasing when zoomed out
  - Improves performance and memory usage for large images
Merge branch 'image_downsampling' into develop

Conflicts:
	pyqtgraph/graphicsItems/ImageItem.py

 - Allow non-ndarray image data
 - Make quickMinMax a normal method

BF: unicode fix for TableWidget

Setting a table item value to a unicode value with non ascii chars would
cause the tablewidget contents to not be displayed (no exception thrown
either).

Changed all instances of str(..) or map(str,...) to use asUnicode and
issue seems to be fixed

Inverted MeshData.cylinder normals

Adds MeshData.cylinder