chore(engine): bump mybatis version to to 3.2.4

- upgrade mybatis dependency to 3.2.4
- fix compatibility issues

related to #CAM-1481
feat(engine): async continuation on parallel GW

support async continuation for parallel gateways

related to #CAM-2217
fix(serialized variable): ensure variable change submission

Related to: CAM-2219
test(serialized variable): add test for serialized variable edition

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fix(distro/jboss): joda time dependency in rest api

do not expose Joda Time Runtime dependency in REST api

related to #CAM-2201
feat(cmmn/core): provide core operations to execute Cmmn native

- Implements new Atomic Operation to execute Cmmn
- First draft of an CmmnActivityBehavior
- adds CoreTestCases

related to CAM-2188
chore(distro): add script engine dependencies to distro/standalone

- add groovy, jruby, jython to all distros and standalone webapps

related to #CAM-2179
chore(groovy): update groovy dependency to latest version

related to #CAM-2179
chore(rest): fix groovy version for restassured
chore(integration-engine): exclude groovy depended test
fix(tasklist): send the variables

Related to: CAM-2224
fix(engine-rest): set groovy 2.1.2 dependency on scope test
fix(tasklist): collect variables on task completion form
 chore(release): Prepare release: set version to 7.2.0-alpha1
 chore(release): Prepare next development version: 7.2.0-SNAPSHOT
chore(scripting): remove python, ruby, retain groovy

remove python and ruby from distributions.
groovy is still in.

related to #CAM-2179
chore(git): add h2 db files to ignore
fix(tasklist): serialize variables form correctly

Related to #CAM-2224
fix(webapp): correct responsive menu behavior

Related to #CAM-2226
fix(qa/it): increase tomcat permgen space for integration-tests