KAZOO-2351: remove unused clauses, update spec
KAZOO-2351: lookup original contact string for inclusion in MWI update
KAZOO-2351: track the original contact string, and allow queries for it

update specs
KAZOO-2351: permit the Original-Contact header in the query API
KAZOO-2196: catch exceptional cases when building tts file
KAZOO-2196: update ibrowse-related types
KAZOO-2196: create engine-specific error responses
KAZOO-2122: cleanup specs/types, use kz_xml helpers
KAZOO-2122: fix unit tests in callflows
KAZOO-2122: add warn on missing spec
KAZOO-2122: add missing specs
KAZOO-2122: formatting
KAZOO-2122: add compile options
KAZOO-2122: treat single Number noun like plain-text dial
KAZOO-2122: add specs
KAZOO-2122: formatting
KAZOO-2122: skip unknown XML tags, like XmlComment

added specs and some logging
KAZOO-2122: move specs, use whapps_call function instead of manual fold
KAZOO-2122: cleanup folds into exec/2

specs and general cleanup

set dial status and call status properly
KAZOO-2122: add some specs, remove unused functions