Fullmarks.tinymceplugins.asciisvg

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- Prevent users from adding an invalid function to the graph. Show an
error and ask them to re-enter the function.

- use single quotes when adding equations to dropdown list since double
quotes don't work on Chrome.

- use regexp syntax for string replacement since the global match flag
(eg s.replace(substr, newsubstr, 'g') is not supported by Chrome.

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- use span rather than div as container to allow inline display of
graphs

- Embed svg source in hidden CDATA section alongside ASCIISvg script.
NOTE: Plone 3's safe_html transform swallows CDATA, Plone 4 works
correctly.

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- use jq instead of $ to invoke jquery for Plone 3 compatibility

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- Initial release