Added support for the AngularJS Eclipse Plugin.

https://github.com/angelozerr/angularjs-eclipse

NOTE: This feature is functioning, except that after theme change, the AngularJS HTML Editor Syntax Coloring preference page will throw an Exception if OK is pressed.

The full stacktrack I saw was:

```
java.lang.IllegalArgumentException: Argument not valid
	at org.eclipse.swt.SWT.error(SWT.java:4378)
	at org.eclipse.swt.SWT.error(SWT.java:4312)
	at org.eclipse.swt.SWT.error(SWT.java:4283)
	at org.eclipse.swt.graphics.GC.setBackground(GC.java:4190)
	at org.eclipse.swt.custom.StyledTextRenderer.drawLine(StyledTextRenderer.java:383)
	at org.eclipse.swt.custom.StyledText.handlePaint(StyledText.java:6106)
	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5642)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
	at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:1491)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4668)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990)
	at org.eclipse.swt.internal.win32.OS.VtblCall(Native Method)
	at org.eclipse.swt.internal.ole.win32.IOleInPlaceObject.InPlaceDeactivate(IOleInPlaceObject.java:21)
	at org.eclipse.swt.ole.win32.OleClientSite.deactivateInPlaceClient(OleClientSite.java:559)
	at org.eclipse.swt.ole.win32.OleClientSite.onDispose(OleClientSite.java:908)
	at org.eclipse.swt.ole.win32.OleClientSite.access$1(OleClientSite.java:895)
	at org.eclipse.swt.ole.win32.OleClientSite$1.handleEvent(OleClientSite.java:129)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:812)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:875)
	at org.eclipse.swt.widgets.Canvas.releaseChildren(Canvas.java:166)
	at org.eclipse.swt.widgets.Decorations.releaseChildren(Decorations.java:790)
	at org.eclipse.swt.widgets.Shell.releaseChildren(Shell.java:1290)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:815)
	at org.eclipse.swt.widgets.Widget.dispose(Widget.java:450)
	at org.eclipse.swt.widgets.Decorations.dispose(Decorations.java:448)
	at org.eclipse.swt.widgets.Shell.dispose(Shell.java:715)
	at org.eclipse.jface.window.Window.close(Window.java:336)
	at org.eclipse.jface.dialogs.Dialog.close(Dialog.java:994)
	at org.eclipse.jface.preference.PreferenceDialog.close(PreferenceDialog.java:318)
	at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.close(FilteredPreferenceDialog.java:698)
	at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.close(WorkbenchPreferenceDialog.java:147)
	at org.eclipse.jface.preference.PreferenceDialog$13.run(PreferenceDialog.java:987)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
	at org.eclipse.jface.preference.PreferenceDialog.okPressed(PreferenceDialog.java:945)
	at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.okPressed(FilteredPreferenceDialog.java:448)
	at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.okPressed(WorkbenchPreferenceDialog.java:171)
	at org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:233)
	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:628)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:826)
	at org.eclipse.jface.window.Window.open(Window.java:802)
	at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.open(WorkbenchPreferenceDialog.java:215)
	at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:65)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:499)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
```