Add class autoloader

[yscik]

Changes Proposed in this Pull Request

• Add a new class autoloader that can be used for WP Job Manager and the addon plugins
• Resolves new namespaced classes to includes/class-{name}.php

Testing Instructions

Usage example in plugins: \WP_Job_Manager_Autoload::register( __NAMESPACE__, JOB_MANAGER_ALERTS_PLUGIN_DIR . '/includes' );

Release Notes

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Plugin build for 0b52eaa6fabb3e1c39b2159bc6746285800d2d2e
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