Try/Catch around json body parsing
Fix ajax cache buster to modify the url before opening

A previous bugfix required opening the request earlier, but accidentally
neglected to move up url modification as well.
Bump version to v0.3.4
Merge branch 'develop'

Conflicts:
	appinfo.json
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Fix card to have a banner method
Use the image size if an image element frame is zeroed
Add Image element docs. Fixes #5
Remove releases