Fixed http code checks

Merge pull request #5 from iZucken/2.2.1

Fixed response codes;

Basic exceptions elaboration

Merge pull request #4 from iZucken/2.2.0

Added different exception types;

Lowered required PHP version;

Merge pull request #3 from iZucken/2.1.0

Lowering required php version to 7.0;

Fixed casting and tests.

Merge pull request #2 from iZucken/2.0.2

Fixed object casting for empty objects and null values;

Merge pull request #1 from iZucken/2.0.0

2.0.0