Add options for request through ssl

[rado-h]

Add options to the transport for ssl request.
Example:
$transport = new Transport\Curl("127.0.0.1", "443");
$sslOptions = array(CURLOPT_SSL_VERIFYPEER => true, CURLOPT_SSLCERT => "/path/to/cert");
$transport->useHttps(true, $sslOptions);
OR
$transport = new Transport\Stream("127.0.0.1", 443);
$sslOptions = array("verify_peer" => false, "cafile" => "path/to/cafile);
$transport->useHttps(true, $sslOptions);

Also when sending request through ssl with context_stream the stream_options array must be with key http for the http options and the ssl specific option must be with key ssl.

[travisbot]

This pull request passes (merged ad6b9fb into 6577edb).

[rado-h]

@jadell I added a simple DI class which may solve the problems with the configurations. The idea is to keep there configuration variables and things such as closures for creating nodes/relationships...etc. I also added a bootstrap file with some initial dependencies to be populated in the DI (Bootstrap.php). Putting more object initialization callbacks in the DI will also allow easier extension of the library.

[jadell]

I like where this is going, but I'd like to make a few changes. It's similar to the "Configuration" class I was thinking of introducing. I'm going to merge this into a branch and tweak it a bit, if that's okay.