RestrictedTextField v1.2

• Now confirmed to work on mobile! See README.md for a list of tested browsers.
• Change to event firing: validation success & validation failure events were firing pre-blur with preventInvalidInput enabled. This is contrary to the documentation, which states that these events do not fire in that scenario. The documentation reflected the intended behavior; the events no longer fire in this scenario.
• Added credit cards types (AMEX, VISA, MasterCard, Discover), plus a credit card type encompassing each of these types
• Added a Luhn type
• Updated and redesigned the demo page
• The unit tests are no longer implemented with Java/Selenium/JUnit; they've been re-implemented in JavaScript/QUnit. This dramatically improves test performance and greatly simplifies running tests (just open the HTML file).