Fix so that parentheses can be written from iOS devices.

Fix so that parentheses can be written from iOS devices.
    * changed the type of the input field (which is used for bringing up the
      on-screen keyboards on touch devices) from email to text
    * when typing in an input field of type email the user is not allowed to
      write parentheses on iOS devices, the keys are disabled.
    * tested on iOS 6, iOS 7 and Android 4.3.