1.1.1

• fixed bug when using similar format name, , as jpeg or tif;
• added TestCase::assertFileExtension() and TestCase::assertThumbPath()
  methods;
• added ThumbTrait;
• added Thumber\TestSuite\IntegrationTestCase class;
• removed thumbUrl() global function. Use instead ThumbTrait::getUrl();
• significantly improved and simplified all tests;
• the MIT license has been applied.