Make the service provider deferred

[Gawdl3y]

This will avoid loading the service provider (and connecting to the Sphinx server) until the provider is actually used. Since most applications will only use the provider on a fraction of pages, it should result in an overall performance increase.
See the deferred providers info in the Laravel documentation.

[dcelasun]

@dvigueras Can you please merge this? Loading this library on every request is wasteful, so a deferred approach would be better.

[dcelasun]

@dvigueras Thanks! Can you also tag a new minor relase?

[alexvikman]

This change seems to have broken the package namespacing of the config when loading it in the construct of SphinxSearch.php.

This works fine.

$host = \Config::get('packages/scalia/sphinxsearch/config.host');

This just returns an empty array now.

$host = \Config::get('sphinxsearch::host');