Merge pull request spotorm#279 from jecksolovyev/master

PHP >= 7.2 generates warning "count(): Parameter must be an array or an object that implements Countable"

v2.1.6

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  * Added 'afterLoad' event that fires with fully loaded entities (thanks @kayladnls)
  * General cleanup of .travis.yml for Ci builds (thanks @localheinz)
  * Limit depth of toArray with relations to single level by default
  * (thanks @jakefolio)
  * Added PHP 7.0 in Travis Ci build