Add options and improve existent

[gregurco]

• [ ] Bug fix
• [x] New feature
• [ ] BC breaks
• [ ] Deprecations
• [x] Tests pass

Fixed tickets: [#97] License: MIT

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Added options:

• allow_redirects - bool or array
• form_params - array
• multipart - array
• sink - string

Modified options:

• base_url - string (was boolean, string, integer, float and null)
• auth - string or array (was array only)
• query - string or array (was boolean, string, integer, float and null)
• connect_timeout - float and int (was boolean, string, integer, float and null)
• decode_content - string and bool (was bool) (Note: string in case of decoding, ex: gzip)
• delay - float and int (was boolean, string, integer, float and null)
• expect - bool or int (was boolean, string, integer, float and null)
• ssl_key - string or array with two elements (was boolean, string, integer, float and null)
• stream - bool (was bool or string)
• synchronous - bool and string (was bool or string casted to string)
• timeout - float or int (was boolean, string, integer, float and null)
• verify - bool and string (was bool or string casted to string)
• cookies - bool (was bool and string casted to bool)
• version - string or float (was boolean, string, integer, float and null)

@florianpreusner I added more strict type for options and now it's fully compatible with guzzle docs. I also wrote tests for options. Any remarks or suggestions?

Guzzle docs: http://docs.guzzlephp.org/en/latest/request-options.html