fix(property-panel/help): adjust help text to latest docs
fix(diagram/boundary-event): fix flow attachment

Sequence flows and associations attach to boundary events properly.

- a boundary event is an event (in the diagram sense) now

Closes CAM-232
Merge branch 'master' of github.com:camunda/camunda-modeler
chore(cleanup): remove commented out text

Related to CAM-1235
chore(morph/test): Add morph feature testcases

- add test cases to test the custom morph feature
- display images for each selectable type in popup

related to CAM-303
Merge branch 'master' of github.com:camunda/camunda-modeler
fix(failed-load): Prevent error dialog

related to CAM-1414
Merge branch 'master' of github.com:camunda/camunda-modeler
chore(project): remove adapter hell

Big autum clean up! Removing EObject adapters that perform(ed) various
kinds of magic from the project because all of the features were not
needed anymore.
fix(dataAssocation/Import): Import DataAssocations

- the data assocations associated with event are not ignored anymore

related to CAM-1441
Merge branch 'master' of github.com:camunda/camunda-modeler
feat(morph/StartEvent): Change EventDefinitionType

- It is possible to morph a Start Event to a Message Start Event for
  example.

related to CAM-308
feat(morph/Throw/Catch/Event): Change Type

- it is possible to change the of intermediate catch and intermediate
  throw events.

related to CAM-286
feat(morph/EndEvent): Change EventDefinitionType

- it is possible to change the event definition type of end events.

related to CAM-306
fix(BoundaryEvent/Append): Show context menu

related to CAM-242
feat(morph/Boundary): Change EventDefinitionType

- it is possible to change the event definition type of a boundary event.

related to CAM-312, CAM-310
chore(morph): Organize Imports
impr(connection): Add rules to create connections

- sequence flow can only be modeled within the same diagram/pool
- message flow can only be modeled between pools
- associations can be modeled between all BaseElements

- Improvement: It is possible to easily connect objects using the context
  menue

- FIX: Fix import of Assosiations which has as source or target another
  Connection (ie. SequenceFlow, MessageFlow, etc.)

related to CAM-283, CAM-281, CAM-874
fix(test-cases): Fix test cases

- if a create connection context does not contain a source or target
  pictogramelement then try to get the source or target via the source or
  target anchor

related to CAM-283
Merge pull request #4 from camunda/master

Merge camunda master