v1.5.0

• Added an index.ts file to the root level of the project, which allows imports of the form import {WizardModule} from 'ng2-archwizard' (see #2)
• Added a new component wizard-completion-step, which is a new wizard step component that is added to the end of the wizard as its last step. It should be used to signal to the user that he/she has successfully completed the wizard
• Added a reset method to the wizard, that can be used to reset its state