expose exchange type as a param, change default to 'topic'
updated signedIdentityToken to support new server format (object, not JSON-encoded string)
set version to 0.0.24
Merge remote-tracking branch 'berico/develop' into develop
final commit after merge from berico
Merge pull request #10 from dschroh/develop

Tested via acceptance tests as working against current develop branch of AMPere.