v2.0.0-alpha.3

• Full test coverage
• Fixed RouteGroup::map() path;
• Added some exclusions for abstract classes in coverage + tests;
• ServerRequestBuilder::addBody() now converts all non-array, non-resource and non-object variables to string;
• Fixed ServerRequestBuilder::addProtocolVersion() for non-string values;
• Updated ServerRequestBuilder::addCookieParams() cookie parsing logic;
• ServerRequestBuilder::addParsedBody() now allows null, array or object as values;
• Updated AbstractRouter:: addControllerActionFromPath() to allow diverse path-to-method-name logic;
• Removed AbstractRouter::isClassName();
• Fixed issue with ServerRequestBuilder::addUploadedFile() not working properly with nested uploaded file spec;
• Fixed issue with factory not being unset in Container::offsetUnset();
• Updated \BitFrame\Http\Message\*Response classes;
• Fixed RouteGroup::map() path;
• Added ext-json dependency to composer.json
• Fixed logic for using nested middleware in MiddlewareDecoratorTrait::getUnpackedMiddleware()