[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release piccolo2d-complete-3.0.1

Update copyright year to include 2019

Fix JDK8 javadoc lint errors

updating project metadata from Google Code to Github transition, fixes #267 (#269)

Issue 262 ; adding getPropertyChangeListeners and getPropertyChangeListeners(String) methods

Issue 263 ; adding @since tags

Issue 263 ; final methods will break binary compability, save for 4.0

Issue 263 ; adding PPath.createPolyline methods

update scm URLs branches/3.0-spike --> trunk

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release piccolo2d-complete-3.0

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release piccolo2d-complete-3.0-beta1-rc2

Issue 166 ; refactor PNode moveToBack and related

Issue 252 ; merge build-related changes from trunk to branches/3.0-spike

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release piccolo2d-complete-3.0-beta1-rc1

update maven scm to branches/3.0-spike

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release piccolo2d-complete-3.0-beta1-rc1

updating maven plugin dependency versions and re-arranging reporting sections

refactoring jdk16 and jdk16-modules back into core and examples respectfully

update version from 2.0-SNAPSHOT to 3.0-SNAPSHOT

Issue 242 ; fix typo in API documentation

Issue 229 ; update maven-checkstyle-plugin dependency version to 2.9

Issue 207 ; ignore mouse pressed and released events with button MouseEvent.NOBUTTON instead of throwing an exception

Issue 236 ; adding zoom event handler that responds to mouse wheel events

Issue 231 ; doc fix, width --> height

Issue 227; (trunk) fixed bounds issue when replacing PCamera on a PCanvas; added relevant tests