Only format changed lines

Update Eclipse cleanup actions to only format changed lines. This will
hopefully help to prevent so many false diffs caused by differences
between Eclipse Luna and Eclipse Mars.

eclipse/org.eclipse.jdt.ui.prefs

@@ -87,7 +87,7 @@ sp_cleanup.always_use_this_for_non_static_method_access=false
 sp_cleanup.convert_to_enhanced_for_loop=false
 sp_cleanup.correct_indentation=false
 sp_cleanup.format_source_code=true
-sp_cleanup.format_source_code_changes_only=false
+sp_cleanup.format_source_code_changes_only=true
 sp_cleanup.make_local_variable_final=false
 sp_cleanup.make_parameters_final=false
 sp_cleanup.make_private_fields_final=false