Adds license information

LICENSE

u2f-gae-demo/src/com/google/u2f/gaedemo/AppModule.java

...com/google/u2f/gaedemo/MyGuiceServletContextListener.java

u2f-gae-demo/src/com/google/u2f/gaedemo/MyServletModule.java

...e-demo/src/com/google/u2f/gaedemo/admin/AdminServlet.java

...c/com/google/u2f/gaedemo/impl/ChallengeGeneratorImpl.java

...e-demo/src/com/google/u2f/gaedemo/impl/DataStoreImpl.java

...c/com/google/u2f/gaedemo/servlets/BeginEnrollServlet.java

...src/com/google/u2f/gaedemo/servlets/BeginSignServlet.java

.../com/google/u2f/gaedemo/servlets/FinishEnrollServlet.java

...rc/com/google/u2f/gaedemo/servlets/FinishSignServlet.java

...src/com/google/u2f/gaedemo/servlets/GetTokensServlet.java

...c/com/google/u2f/gaedemo/servlets/RemoveTokenServlet.java

.../src/com/google/u2f/gaedemo/servlets/U2F_DemoServlet.java

...e-demo/src/com/google/u2f/gaedemo/storage/SecretKeys.java

.../src/com/google/u2f/gaedemo/storage/TokenStorageData.java

...e-demo/src/com/google/u2f/gaedemo/storage/UserTokens.java

u2f-gae-demo/src/soy/admin.soy

u2f-gae-demo/src/soy/card.soy

u2f-gae-demo/src/soy/header.soy