IdentityPage: Fix English grammar of documentation
LogInPage: JavaDoc
CreateIdentityWizard: Allow third-party plugins to use it:
- We already had code which allows third-party plugins to use the LogInPage by specifying a HTTP param "redirect-target" to redirect the browser back to the other plugin after login.
- This commit changes the LogInPage to pass the redirect-target to the CreateIdentityWizard and changes the CreateIdentityWizard to preserve it and to pass it back to the LogInPage when making the user log in after creating the identity.
- CreateIdentityWizard.getURI() was inspired by IdentityPage.getURI()