Make default_socket_timeout match PHP 5.x

Summary: `default_socket_timeout` in PHP 5.x defaults to 60 (seconds). Make that be the default for HHVM as well.

Reviewed By: @paulbiss

Differential Revision: D1674055

Signature: t1:1674055:1415745395:68da6ac38e41d059338bd5236292cba4ad752957
Replace tabs with spaces in new test file

Summary: Use tabs instead of spaces in `xml_Option_Skip_White.php`.

Reviewed By: @paulbiss

Differential Revision: D1674206

Signature: t1:1674206:1415747466:367a0ce3010332b1078b1c693920e4bd8e9cfe62
SplFixedArray::FromArray() throws InvalidArgumentException not Exception

Summary: Fixed #4211
Closes https://github.com/facebook/hhvm/pull/4213

Reviewed By: @JoelMarcey

Differential Revision: D1673801

Signature: t1:1673801:1415767159:cb5f6929704ac56e0c0568e7108c88d13af0b366
Expose Imagick::getImageMimeType to userland

Summary: Fixes #4047

Closes https://github.com/facebook/hhvm/pull/4173

Reviewed By: @JoelMarcey

Differential Revision: D1666889

Signature: t1:1666889:1415767154:b10cbeeffe6c641cbf38264be3520234b77dcaf4
Show a nice error when an invalid argument is passed to hphp -t

Summary: fixes facebook/hhvm#4205 - previously would trigger an assertion failure for doing an analyze without a format

Reviewed By: @jdelong

Differential Revision: D1673786

Signature: t1:1673786:1415746228:c002f8f24fb44dd9719d1e095a9e6195bac74cca