Show cause of error when opening drag-&-dropped files fails.
Plumb the error code back from the FILE_OPEN command, and display errors
in the existing bullet list error dialog used by DragAndDrop.
Sprint -> Release
Uppercase Release
add link to troubleshooting page to live preview error messages
restore string
Quick Docs: Ignore vendor prefixes if needed
fix typo
Add unit test to verify that FILE_OPEN command now returns error code when
it fails.

Also, cleanup: group image-related tests into a single describe() instead
of a separate one per it().
Merge remote-tracking branch 'origin/master' into pflynn/dragdrop-errors

And clean up blank-line spacing in DocumentCommandHandlers-test
change for code review
Navigate through Extension Manager tabs via Ctrl-(Shift)-Tab
Fix minor TimingFunction validation issue
Remove unused vars
Add references to utils/Global back
Fix Travis failure
Italian language for Brackets 1.0 (#0.44)
Fix "globals" option
Add "showCursorWhenSelecting" pref
Fix QuickView popover being in the wrong pane
Merge remote-tracking branch 'upstream/master' into unused-vars

Conflicts:
	src/brackets.js
	src/document/DocumentManager.js
	src/editor/EditorManager.js
	src/editor/ImageViewer.js
	src/extensions/default/JavaScriptQuickEdit/unittests.js
	src/extensions/default/UrlCodeHints/unittests.js
	src/language/CodeInspection.js
	src/project/WorkingSetSort.js
	src/project/WorkingSetView.js
	src/search/FindReplace.js
	src/search/ScrollTrackMarkers.js
	test/spec/FindReplace-test.js
	test/spec/LanguageManager-test.js