Merge pull request #29 from md-systems/8.x-1.x

Update watchdog calls
Merge pull request #30 from md-systems/state

Use state for the last_optimize value.
Fix for failing tests
Merge pull request #31 from mollux/fixes/testfix

Fix for failing tests
Fixed deprecated WATCHDOG_WARNING constant usage
Replace drupal_strtolower() calls
Updated search_api repository to offical project
Updated namespaces, class names and plugin folders
Fixed usage of protected server name property.
Merge branch '8.x-1.x' into commitwithin
Merge branch 'chase-search-api' into commitwithin