Added cx_freeze example (thanks Jerry!)
Added scrolling plot examples
Added image analysis example
Fixed relativity example
Update CONTRIB with instructions on checking style
Added GLVolumeItem.setData
Added methods for saving / restoring state of PloyLineROI
Add ErrorBarItem.setData
Note about version method was added
Link ErrorBarItem in documentation
Fixed typo in readme
Merge pull request #77 from tfeldmann/patch-1

Fixed typo in readme
Correct LegendItem addItem to use next available row
Merge branch 'develop' of github.com:pyqtgraph/pyqtgraph into develop
Added GLImageItem.setData()
Add AxisItem.setTickSpacing()
Correction in GraphicsItem.deviceTransform() during export.
This fixes some (all?) issues with exporting ScatterPlotItem.
Squashed commit of the following:

commit ca3fbe2ff9d07162e4cc4488f4280f0b189f86e8
Author: Luke Campagnola <luke.campagnola@gmail.com>
Date:   Thu Aug 7 08:41:30 2014 -0400

    Merged numerous updates from acq4:
    * Added HDF5 exporter
    * CSV exporter gets (x,y,y,y) export mode
    * Updates to SVG, Matplotlib exporter
    * Console can filter exceptions by string
    * Added tick context menu to GradientEditorItem
    * Added export feature to imageview
    * Parameter trees:
        - Option to save only user-editable values
        - Option to set visible title of parameters separately from name
        - Added experimental ParameterSystem for handling large systems of
            interdependent parameters
        - Auto-select editable portion of spinbox when editing
    * Added Vector.__abs__
    * Added replacement garbage collector for avoiding crashes on multithreaded Qt
    * Fixed "illegal instruction" caused by closing file handle 7 on OSX
    * configfile now reloads QtCore objects, Point, ColorMap, numpy arrays
    * Avoid triggering recursion issues in exception handler
    * Various bugfies and performance enhancements
Fixes following acq4 merge
Disable image downsampling when n=1