Remove es5: true setting from /.jshintrc

This setting throws an error in JSHint 2.0.0 and above, as explained by
http://jslinterrors.com/es5-option-is-now-set-per-default
Add test for altField focus redirection
Add test for altRedirectFocus option
Add altRedirectFocus option

If set to true (default), the altField will redirect focus to the main
field (this is how it always worked before this change). Otherwise, the
altField will not redirect its focus, and the altField will behave as a
normal text field that can be edited by the user.
Merge pull request #725 from emlun/redirect-focus-option

Add altRedirectFocus option