Disable editable fields when viewing existing files
Add "Open wiki page" button to details on completed items.

Opens the file's wiki page in an in-app browser, with a menu item
allowing to open in external browsers.

BrowserHelper class manages the action sheet for this, can detect:
* Safari (always on)
* Chrome
* Opera Mini
* Dolphinm
Removed some resolved 'fixme's
Merge remote-tracking branch 'upstream/master'
Merge pull request #10 from felixmo/master

Clean up some resolved 'fixme's
Implemented failure blocks for operations
Added alerts for certain failures (ex. incorrect credentials, refresh failed, upload failed, etc.)
Only enable 'Upload' button when there are files queued for upload
Merge remote-tracking branch 'felixmo/master'