fixed ref error in shell.js
add better handling of native menu actions, add handlers for backup
now sending alert message to shell when menu action can't be handled
added message for backup to file for when instide copay shell
Merge branch 'master' of github.com:bitpay/copay into feature/copay-shell
added handling of importing a backup
merged email modal and wired up copay shell integration for it
remove whitespace
Merge branch 'master' of github.com:bitpay/copay into feature/copay-shell
Merge pull request #529 from gordonwritescode/feature/copay-shell

WIP: Copay Shell Integration 2