Comments of source code.

Comments of source code.
Comments were added to files:
- BindingGeneratorImpl.java
- BaseYangTypes.java
- GroupingDefinitionDependencySort.java
- NodeWrappedType.java
- TypeProviderImpl.java
- UnionDependencySort.java
- AbstractBaseType.java
- BindingGeneratorUtil.java
- ReferencedTypeImpl.java
- TypeConstants.java
- Types.java
- EnumerationBuilderImpl.java
- BuilderGenerator.java
- BuilderTemplate.xtend
- ClassTemplate.xtend
- Constants.java
- EnumGenerator.java
- EnumTemplate.xtend
- GeneratorJavaFile.java
- GeneratorUtil.java
- InterfaceGenerator.java
- InterfaceTemplate.xtend
- TOGenerator.java
- CodeGenerator.java
- Enumeration.java
- WildcardType.java

-> new class NodeWrappedType was created instead of GroupingDefinitionNode a
UnionNode
-> the method resolveListTypeBuilder of BindingGeneratorImpl was removed and
its using was replaced with method addDefaultInterfaceDefinition

Change-Id: Iea6317aea75bc37883cf0f2fbf094cb8d4f02f00
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>