Various feedback from @allejo

[chrismetcalf]

• composer.json should probably be updated with the new PHP requirement
• unless you're mixing PHP with another language, the closing "?>" at the end of the file isn't necessary.
• do you intend to expose Socrata::create_query_url and Socrata::create_curl_handle publically? if not, they can be private or protected
• regarding phpunit, you're relying on whatever's installed on the tester's computer which may not be the same version you're using
• When would the constructor return false? https://github.com/socrata/soda-php/blob/master/public/socrata.php#L24 if something isn't configured correctly in the constructor then an exception should be thrown instead