start working towards v4.0
remove ruby-1.8.7 and ruby-1.9.2 support
remove v3 deprecations
Guardfile updates
remove model loading code from config.rb
allow path options to be set in config.rb
cleanup/refactor configuration helpers
move cache_path setting to Storage::Dropbox
change default data_path to `.data`
use :starttls as default for Notifier::Mail#encryption
remove decrypt command
remove trigger folder from Storage::RSync dest_path
refactor Cycler
update dependencies
option to set suffix length for splitter
Add rake as a development dependency.

Rake is used in development, but is not indicated as a dependency.
'bundle exec rake' fails without it.
README typos
prevent mutation of options to delete_multiple_objects

closes #510
fix dependencies
update fog logger adapter