import_zend_test.py now executes CLEAN sections properly

Summary: php-src is inconsistent with test's CLEAN section. Sometimes it starts with php open tags sometimes it doesn't.
e.g. https://github.com/facebook/hhvm/blob/master/hphp/test/zend/bad/ext/gd/tests/imagegd_nullbyte_injection.php

Also, php-src doesn't execute the CLEAN section when the test is executed. So all errors will be ignored. set error_reporting to 0 when the CLEAN section begins to ignore all errors as well.

Talked to ptarjan on IRC because my reimport will do stupid things and maybe a really nice oncall will do me the favor and reimport the whole thing? :)

Also PHP 5.6.1 is out, I don't know if it makes sense to start the import of the new version without importing 5.6.0 again.

From what I see from my import this should fix a bunch of bad tests :)
Closes https://github.com/facebook/hhvm/pull/3910

Reviewed By: @ptarjan, @JoelMarcey

Differential Revision: D1597942
hh_ide - output js objects instead of json

Summary: Instead of using out custom json pretty printing library, we'll now turn those same objects into javascript objects using js_of_ocaml's library functions.

Then, if we want json, we can use the native javascript's JSON.stringify to turn it into perfect json, instead of our hacky thing. (This'll be faster too.)

Also, this will let callers simply look inside the object instead of having it serialized and then deserialized for no reason (faster).

Reviewed By: @jwatzman

Differential Revision: D1598170