Specifying default args given to curl.
Adding --connect-timeout and --max-time arguments.

- http://curl.haxx.se/docs/manpage.html#--connect-timeout
- http://curl.haxx.se/docs/manpage.html#-m
Copying rather than moving config.yml.
Handling user interrupts.
Gracefully handling curl / api errors.

- Handling connection failures.
- Handling operation timeouts.
- Handling user interrupts.
- Handling unknown errors.
Refactoring code.

- Handling passphrases via new Passphrase class.
Adding to_bd and to_xcr methods to NilClass.
No newline at end of file.
Escaping forward slash character.
Update Changelog.md