seem to need to stroke every time, getting rects with border colors wrong. Will investigate using precompiled canvas paths to improve performance
fixed #328
rename zoom tool to wheel zoom tool
more zoom -> wheel zoom renames
remove spurious unused file
Merge branch 'master' into session-improvements

Conflicts:
	bokehjs/demo/candlestick.html
	bokehjs/demo/gmap.html
	bokehjs/demo/grid_plot.html
	bokehjs/demo/grouped_bars.html
	bokehjs/demo/image.html
	bokehjs/demo/lorenz.html
	bokehjs/demo/map_label.html
	bokehjs/demo/map_overlay.html
	bokehjs/demo/stacked_bars.html
	bokehjs/demo/vector.html
	examples/glyphs/colorspec.py
	examples/glyphs/dateaxis.py
	examples/glyphs/glyph1.py
	examples/glyphs/glyph2.py
	examples/glyphs/grid.py
	examples/glyphs/iris.py
	examples/glyphs/line.py
	examples/glyphs/line2.py
	examples/glyphs/line_animate.py
	examples/glyphs/maps.py
	examples/glyphs/prim.py