added gradle wrapper
pulled in mockito dependency
fixed bug with JRSerializer where trying to serialize a SurveyModel that points to the lastquestion blows up as the TreeReference is null
added dialogue handler interface to allow external code to interact with surveys based on library strategies
added static methods to SurveyConverser to initialize a survey and respond to answers
bump version number
fixed up permission bit on gradle wrapper
Merge pull request #5 from smap-consulting/add-dialalogue-handler

Add dialogue handler