seeOptionIsSelected should also accept value not only text

At present this will work for PHP Browser module:

$I->seeOptionIsSelected('#select', 'My Option Text');

but this will not:

$I->seeOptionIsSelected('#select', 'my-option-value');

It would AMAZING if the second worked.

Start at the PHP Browser module's seeOptionIsSelected entry point and inspect how it currently matches an option. Done means the existing text argument still works and the option's value, such as "my-option-value", is also accepted; add or run the relevant tests if the repository provides them.

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