Pass page data to iframe using events/attributes

This seems to be much more efficient than data:// URIs.
Remove enableScript and enableFlash options

These are no longer supported, since we're not using data:// URIs
Don't pass enableScript/Flash into _writeContentFrame

These are no longer supported
Merge branch 'no_data_uris' into development
Merge branch 'release-3.1.17' into development
version bump to 3.2.0beta1
Update min/max FF version to 32.0
Version bump to 3.2.0
Update URLs in metadata from Sourceforge to Github
Updated release notes
Merge branch 'release-3.2.0'