defaultValue of 0 now displayed

previously treated as empty string when passed to input text/textarea
tests for displaying `defaultValue` of 0
separate new tests into respective file
Hold PhantomJS version at 1.9.0-1.

And don't attempt any chmod magic, either.
Merge pull request #261 from benjamn/phantomjs-1.9.0-1

Hold PhantomJS version at 1.9.0-1.
Merge pull request #258 from chenglou/patch-3

defaultValue of 0 now displayed