Fix example name in glyphs/line2.py
Float64Array is not supported by phantomjs, so use Array instead
Rename generated *.html files to match *.py files
Fix None case in HTMLFileSession.dumps()
Use BOKEH_BROWSER="dummy" to stop show() from opening a web browser
Add *.png to .gitignore in glyphs/ and plotting/file/
Discover examples for testing from glyphs/ and plotting/file/