Fixed a typo in proxy.js

Aaaah, I love last-minute modifications \o/

Fixed some bugs with btim/optional dependencies.

A few regressions were introduced in the last version:
- *optional* module was not correctly used
- interface selection was performed before mac spoofing, resulting in a disabled interface if spoofing used
- typos

Uses the updated version of optional btim module, btlejuice-proxy has…

… some options. (DigitalSecurity#21)

* Integrated abilities to bring an interface up and spoof a MAC address.

* Fixed indentation.

* Removed a useless part which brought up an interface before attempting to spoof a MAC address.

* Added the possibility to list bluetooth interfaces.

* Renamed properties of an object describing an interface. Listing intetrfaces is more staightforward.

* The module btim became optional (dependent options are enabled if it's present), btlejuice-proxy brings up the specified interface and is able to list interfaces.

Merge branch 'master' of github.com:DigitalSecurity/btlejuice

New version 1.1.4

Release version fixed.

Released version 1.1.2.

Bumped to version 1.1.1 because of a previous erroneous version number.

Release version 1.1.0

Added Web UI documentation.