Update copyright year to include 2019

Issue 205 ; updating copyright year in license header to 2011

applying patch and unit test from Issue 206 to clear caches

Issue 37 ; refactoring package edu.umd.cs.piccolox.swt to org.piccolo2d.extras.swt in swt

Issue 37 ; refactoring package edu.umd.cs.piccolox to org.piccolo2d.extras in extras

Issue 37 ; refactoring package edu.umd.cs.piccolo to org.piccolo2d in core

updating copyright years to include 2010

adding Point2D getCenter() method to PSWTPath, with unit tests

adding license headers for extras and swt unit tests

Removing check for headless mode in tests. w00t.

Testing Hudson's Xvnc plugin to see if we can run failing tests. Some tests wouldn't run in headless mode. Crossing fingers.

Adding tests for PSWTBoundsHandle and PSWTCanvas also refactoring PSWTCanvas a little.

Fixing some checkstyle warnings and adding more tests for PSWTHandle.

Adding unit tests for PSWTHandle

Adding PSWTImage and checkstyle cleanup.

Adding unit tests for PSWText. Unfortunately, these won't run in hudson, but that's not really the point I guess. Higher quality code is.

Getting SWT test to be ignored when running them in headless mode.

Ugh, Test still failed. Implicit setText call on creation of PSWTText on setUp.

Test added doesn't work in headless. Will need to figure something out. Otherwise SWT module will remain untestable.

Cleaning in PSWTText code a little.