* Refactored AssetsTransformer
Casted all ids to int, escaped all text values,
* Added warranty_expires attribute to Asset model
$asset->warranty_expires contains a Carbon object with the warranty
expiration date. Returns null when either purchase_date or
warranty_months are not set.
* Ignoring php-cs cache files
* Restored asset tests expectations
Work in progress - tests still fail
* API controller refactoring, fixed HTTP status codes in responses
* Restored $request->get - debugging
* Added further checks in ApiAssetsCest::updateAssetWithPatch
* /api_tests: Fixed bugs in update() method + code formatting
* /api_tests: Minor code formatting
* /api_tests: Mirrored test code for PATCH and PUT methods
* Removed repeated code
* Test cleanup
* Fixed issues with update() through PATCH and PUT methods
* Added API test suite to .travis.yml
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