Adds active scope to notes.

Notes are no longer immediately deleted. Instead they are marked
inactive.
Adds update_sequence_number to CloudNote.
Updates gems.
Refactors Evernote syncing.

All methods involved in Evernote Syncing are now in the models
themselves.
Updates styling.

Paragraphs in Notes lists are now blockier.
Fixes RSpec threadsafe issues.
Adds common sync methods.