refactor/rename _glyph_param_setup() in plotting.py
renaming plotting.instrument variable to _PLOTLIST

module-level globals should be in caps or otherwise distinguished. Since this is a bokeh-internal feature and not meant to used by others, I prefixed with an underscore.
fix #259
Added missing show() call in animated Notebook example.
Merge branch 'master' into session-improvements

Conflicts:
	examples/glyphs/colorspec.py
	examples/glyphs/glyph1.py
	examples/glyphs/grid.py
	examples/glyphs/line.py
	examples/glyphs/line_animate.py