generated files for a more robust attached-link-dialog, including:
  - attachLink.js
  - attachLink.xul
in attachLink.js
  - defined onLoad function to focus on the input textbox
  - defined submit and cancel functions

in attachLink.xul
  - organized the window structure

in zotero/zoteroPane.js addAttachmentFromURI()
  - blocked out the nsIPromptService
  - initiated calling of the new attachLink dialog
  - established an argument to pass the itemID to the new window
in attachLink.js
  - expanded submit function to clean the link entered and attach to the item
  - expanded submit function to prevent attaching link to file and displaying an alternate message to the user
  - expanded submit function to alert user of an unrecognized uri

in attachLink.xul
  - defined global key short cuts for submit (return key) and cancel (escape key)
  - defined multiple messages to be displayed depending on the user input
  - tied messages to zotero.dtd file

in attachments.js (ported from branch linkURI commit 55bc0ca)
  - in function cleanAttachmentURI, removed regex filters and utilized nsIIOService for screening
  - in function linkFromURL, removed regex filter
  - in function linkFromURL, altered title generation function to prevent it from generating a blank title if the last character in the string is '/'

in zoteroPane.js
  - in addAttachmentFromURI, removed the commented-out nsIPromptService code that was left over from the fork
  - in addAttachmentFromURI, made the window resizable

in zotero.dtd
  - added entities for the attachLink window

TODO:
[ ] tweak overall window design (e.g. size, button positioning, textbox width, etc.)
[ ] correct window flex when an alternate message is displayed (window doesn't currently expand to display all visible content)
[ ] automatically submit file links to the linkFromFile function instead of displaying an error?
Merge commit '5ad8fa014f8a9e07a481e08e2847ce8db3b9cd33' into linkURI

Conflicts:
	chrome/content/zotero/xpcom/attachments.js
	chrome/content/zotero/zoteroPane.js