AbstractFilesystemResolverTest + CacheManagerTest
add WebPathResolverTest testing default settings

* update composer.json to include required components for default settings
add @covers annotation for existing tests
add CacheManagerTest::testGenerateUrl
add BasePath/-Url & Rewrite tests for WebResolver
add tests for WebPathResolver::clear
move CacheManagerAwareInterface out of WebPath
fix AmazonS3Resolver::resolve on existing & remove
fix misleading phpDoc for getBrowserPath methods
add test ensuring AmazonS3Resolver does not clear
update NoCacheResolver::resolve to set base path
test invalid dir in AbstractFilesystemResolver
add CacheClearerTest
skip CacheClearerTest if interface is missing
add DataManagerTest
add FilterManagerTest
add FilterConfigurationTest
add PdfTransformerTest, add TransformerInterface
clean up phpDoc and use-statements
add FileSystemLoaderTest