[FEATURE] Make a start on Prompt support on Asterisk

* Only an outline so far
* Starting with all MRCP
Revert "[CS] Celluloid is always loaded"

This reverts commit 125da15d6b4618cc119aa32a9395b40ee75a30c3.
[BUGFIX] Comparing Match complete reasons should fail with different NLSML
[FEATURE] Handle various modes of Prompt completion on Asterisk

* Upgrade to RubySpeech develop branch (soon to be 2.0) to properly handle MRCPv2 NLSML