correctly show email inputs

this makes the inputs more user friendly.

as per the [docs](http://developer.android.com/reference/android/widget/TextView.html#attr_android:inputType) the for an email input the correct flags are `TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_EMAIL_ADDRESS`, rather than  `TYPE_TEXT_VARIATION_EMAIL_ADDRESS`.

Although it's a small thing, it allows the user a more simple interface, as the keyboard shown will be presented for a email friendly input