Address silent failure of unrecognized URIs in Attach Link to URI

Generated files for a more robust attached-link-dialog and localized strings
* AttachLink.js
* AttachLink.xul

zotero/xpcom/attachments.js
* created function cleanAttachmentURI
* in function linkFromURL, removed the regex constraints and the comment list of valid protocols
* removed outdated function declaration from beginning of script
* Improved automatic title generation mechanism
Merge pull request #510 from mtd91429/linkURI

Link URI re: issue #486