Added generation of Transfer Objects from Type Definitions.
Extended functionality of Type provider to resolve Type Definitions in schema context as GeneratedTransfeObjects with proper package names and
class names;
Updated generateTypes in BindingGeneratorImpl to generate also Transfer Objects from Type Definitions;
Added BindingGeneratorUtil to replace functionality of CodeGeneratorHelper;
Modified EnumerationBuilderImpl - changed visibility from package protected to public due to need for generation of stand alone enums;
Refactored GeneratorUtil with use of BindingGeneratorUtil methods;
Fixed bug in where SchemaPath was incorectly generated for yang types in yang-model-util project;
Changed YangModelParser API - removed parseYangModel method and changed parseYangModels param from vararg String to List of Files and from vararg InputStream to List of Input Streams;
Modified YangToSourcesMojoj and GenerateSourcesTest in maven-yang-plugin due to change in YangModelParser API;
Modified YangToSourcesPluginTest due to change in YangModelParser API;
Modified Demo in binding-model-demo due to change in YangModelParser API;
Modified GeneratedTypesTest in binding-generator-impl -> changed load of yang files due to change in YangModelParser API;
Added comment generation for interface and class definition in binding-java-api-generator -> GeneratorUtil;
Change-Id: Id1be574e10f7f80d1badfbdec2bcc4a98564fee5
Signed-off-by: Lukas Sedlak <lsedlak@cisco.com>