Revert to v1.7.3 version of `ATConnect.h` for a clean diff view of the API changes.
Revert to v1.7.3 version of `ATConnect.h` for a clean diff view of the API changes.

hibu/apptentive-ios,Jawbone/apptentive-ios,apptentive/apptentive-ios,hibu/apptentive-ios,sahara108/apptentive-ios,hibu/apptentive-ios,apptentive/apptentive-ios,ALHariPrasad/apptentive-ios,sahara108/apptentive-ios,ALHariPrasad/apptentive-ios,Jawbone/apptentive-ios,apptentive/apptentive-ios