Add callback to importFromURL for drag-dropped PDFs instead of setTimeout
Fix some bugs with charset encoding on import
[RDF] QNAME fixes
* Allow periods in QNAMEs
* Don't break when there are illegal characters in the predicate. Use the strategy proposed at http://www.w3.org/TR/2014/REC-rdf-syntax-grammar-20140225/#section-Serialising (generate namespace that consumes all illegal characters)
* More robust namespace name generation

Closes #128
For detectWeb, ignore translators targeting iframes with same URL
Addresses https://forums.zotero.org/discussion/36104/wall-street-journal-translator-not-working/
add COinS export support for all item types via DC
remove unnecessary if statements and some clean-up. Don't put ISBN and ISSN into DC.identifier, since they're being added to all items as issn and isbn anyways.
Merge pull request #470 from aurimasv/detect-iframe

For detectWeb, ignore translators targeting iframes with same URL
Merge pull request #461 from aurimasv/rdf-qname

[RDF] QNAME fixes
Merge pull request #456 from aurimasv/import-charset

Fix some bugs with charset encoding on import
Merge pull request #472 from adam3smith/coins

add COinS export support for all item types via DC
Fix lookup box sizing on subsequent opens
Merge pull request #328 from aurimasv/pdfdrop

Add callback to importFromURL for drag-dropped PDFs instead of setTimeout
Create README.md
Retina tree twisties for OS X

Using separate arrows from treetwisty.svg from Mozilla, since it doesn't seem
to be possible to use list-style-position in the tree

The reason we still have to do this at all is that coloring of the twisties in
the tree still gets messed up as you move around the tree. (This still happens
in Places and Thunderbird as well.)
Disable RIS note attachments by default
Merge pull request #476 from aurimasv/RIS-notes

Disable RIS note attachments by default
Use new Z icon in Add-ons window
Update translators and repotime
Don't show "Status bar icon:" pref for Firefox 29+
Only enable Add Item by Identifier resizing logic on Mac

This seems to be unnecessary and screw things up on other platforms.