ENH: use fewer points for 3d quiver plot
ENH: Added new kwarg to legend to control the placement of legend markers and labels. One now has the ability to place the marker to the right of the label.
TST: Added test for legend with markers to the right of labels
STY: pep8 fixes to legend
TST: Removed legend.py from excluded pep8 testing since it now passes
DOC: Added some text in whats_new for the marker label placement
functionality
Merge pull request #3499 from cimarronm/legend_marker_label_placement

ENH : Legend marker label placement control
Merge pull request #3760 from perimosocordiae/quiver3d

PRF : use fewer points for 3d quiver plot