Use a QDoubleSpinBox instead of a QLineEdit for the snapping
 tolerance, make the treeview columns adjust better to the size of the
 contents
Use GEOS reentrant API (_r functions) and update requirement to GEOS >= 3.1.0

Currently QGIS uses the 'classic' GEOS API that uses a global context.
This can conflict with libraries that would also use the global context
and potentially finalize it whereas QGIS will still use it later.

See https://groups.google.com/forum/#!topic/spatialite-users/9YSU6c5AVQ4 for
such an example of such a recent issue with Spatialite.

The _r API is available since GEOS 3.1.0, which is already an ancient GEOS
version. For example, old-old-stable Ubuntu (Lucid 10.04) and Debian (squeeze)
ship with GEOS 3.1.0 or later.

Such move has also been done in GDAL 1.11
(http://lists.osgeo.org/pipermail/gdal-dev/2013-August/036877.html)
and MapServer 7.0 (https://github.com/mapserver/mapserver/issues/4733)

There's no easy way unfortunately to check at compile time that you don't
use the non _r API. I have patched my geos_c.h header to #ifdef that API (quite
painfull to do..). A postprocessing check can be done however with :

objdump -T output/lib/*.so | grep -v Base | grep GEOS | grep -v _r | grep -v "_ZN" | grep -v GEOSversion

It should return nothing.
[heatmap-plugin] replace messagebar to messagebox
[context-help] set heading to 3 for heatmap plugin and python console help file
Automatic update of label and neighboring ranges boundaries
creation of a convertToRuleBasedRenderer() function
add sip
use previous renderer if possible, instead of last applied renderer
Add factory annotation and use clone for rule based renderer
refactor to a more general convertFromRenderer function
update
Set auto raise for attribute table buttons to match reset of UI
[SIP] add missing activated/deactivated signals for map tools
Retain alpha if entering colors with no explicit alpha into
QgsColorTextWidget
Non editable color schemes should not be editable in QgsColorSchemeList
Accept dropped colors on color widgets
Support dragging colors from QgsColorPreviewWidget
fix signal in QgsDateTimeEdit
Reduce margins on bookmarks dialog
Fix toolbar order with add and new buttons