Fix for bug 960420

Variable 'totalSyncChunks', used to compute progress, can be zero.
Added defensive code to avoid divide by zero error.
Fix for bug #960420

1. Change Evernote API key and secret to new Mozilla account
2. Change developer info to Mozilla
Undo wrong changes.
Merge pull request #11 from yor-mozilla-com/fix960420

Fix for bug 960420