Updated name of plugin in test/addPlugin
Instance variable name is automatically prepended with jquery-plugincreator- in order reduce the chance of data attribute name clashes.
Instance variable name is automatically prepended with jquery-plugincreator- in order reduce the chance of data attribute name clashes.
Added test for pluginCreator.addPlugin(name, constructor).
Added test for pluginCreator.addPlugin(name, null, defaults).