Added cylinder geometry to opengl MeshData
GLViewWidget.itemsAt() now measures y from top of widget.
Merge branch 'cylinder_mesh' into develop
Adds MeshData.cylinder
Added Vector.angle method
Inverted MeshData.cylinder normals
Cylinder base moved to z=0
Added ViewBox.setBackgroundColor()
Fixed unicode titles in Dock
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
Merge pull request #35 from isolver/develop

BF: unicode fix for TableWidget
ImageView updates to improve subclassing flexibility:
 - Allow non-ndarray image data
 - Make quickMinMax a normal method