Added "Save Link As Zotero Snapshot" and "Save Image As Zotero Snapshot" options to the browser content context menu where appropriate
Other fixes:
- Implemented standalone image and plugin snapshots the right way (as opposed to the fairly broken way from yesterday)
- Only natively handled files are loaded into a hidden browser when using importFromURL() -- plugin files are now saved directly with saveURI()
- indexDocument() doesn't try to index non-text files
Notes:
- There's no feedback when saving large files, which will likely be a bit confusing for users -- one option would be to put the transfer into the downloads window, though that's a little weird.
- I suspect this will fix the reported JSTOR PDF download issue (http://forums.zotero.org/discussion/217/), though I don't currently have a way of testing it.
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