BugIssue97: Callbacks on callouts do not work

For now adding only the onShow callback call which will work only with registerHelper and specified in the callout json. The listen will not work, an issue which will get fixed as part of an upcoming refactor.
Merge pull request #100 from kate2753/master

Release v0.2.2
Merge pull request #102 from k10world/master

BugIssue97: Callbacks on callouts do not work