Bug 904731 - [browser] text entered into search bar containing dot (.) should not be treated as url address if it has whitespaces

https://bugzilla.mozilla.org/show_bug.cgi?id=904731

1. Space between any words should also be keyword search.
2. Update utilities_test.js, 'www.blah.com foo' and 'a?some b' should not be url.