Prequisites before running Shindig for PHP

[nicerobot <ni...@gmail.com>]

There is an additional require for Shindig for PHP before it will run
successfully which the README makes to reference to. You must not be
in running in safe_mode nor have open_basedir set in php.ini. Both
(presumably, I'm only certain about open_basedir) will cause:

   Warning: curl_setopt() [function.curl-setopt]:
CURLOPT_FOLLOWLOCATION cannot be activated when in safe_mode or an
open_basedir is set...


And although it's just a warning, it will occur in some javascript
files and cause the gadget to fail to run. For example,

../shindig/php/gadgets/proxy?refresh=3600&url=http%3A%2F%2Fwww.labpixies.com%2Flib%2Flp_utils_all_cookie.js


Referring to README @ http://incubator.apache.org/shindig/#tab-building

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