Persist the `enabled_` boolean
Persist the `enabled_` boolean

Added calls to `chrome.storage.local.set` and `chrome.storage.local.get` to persist the `enabled_` boolean.
jamgregory/crouton,nromsdahl/crouton,nromsdahl/crouton,jamgregory/crouton,nromsdahl/crouton,dnschneid/crouton,nromsdahl/crouton,dnschneid/crouton,dnschneid/crouton,jamgregory/crouton,jamgregory/crouton,dnschneid/crouton,jamgregory/crouton,jamgregory/crouton,dnschneid/crouton,dnschneid/crouton,nromsdahl/crouton,nromsdahl/crouton