Update gitignore to ignore some eclipse preference files.

eclipse/.metadata/.plugins/org.eclipse.core.runtime/.settings/.gitignore

@@ -7,3 +7,6 @@
 /org.eclipse.ui.workbench.prefs
 /org.eclipse.wst.sse.core.prefs
 /org.eclipse.epp.usagedata.gathering.prefs
+/org.eclipse.debug.ui.prefs
+/org.eclipse.jdt.ui.prefs
+/org.eclipse.ui.ide.prefs

eclipse/.metadata/.plugins/org.eclipse.debug.ui/.gitignore

@@ -1 +1,2 @@
 /dialog_settings.xml
+/launchConfigurationHistory.xml