Added classes and interfaces: Component, Context, Builder
Added Node class: Text

Others:
- Added handleText() to Context
- Added test class: TestContext
Added Node classes: Element, EmptyElement
Added Node class: Code
Added Node class: None
Added classes: Container, NodeList
Added Node class: ContainerElement
Added Node class: Comment
Arranged methods
Added classes: Renderer, AbstractRenderer, XmlRenderer, SgmlRenderer
Added class: Indent
Added interface: BreakControl and concrete class: DefaultBreakControl
Added class: MinimalBreakControl
Added class: BreakControlWrapper
Added class: NameBreakControl
Added class: DefaultContext
Added class: DefaultBuilder
Added class: DebugContext
Added class: DebugBuilder
Added classes: Helper, HelperObject