Added Markup module.

- All classes and incomplete unit tests.
Added: Peach_Markup_None
Modified Exception type.

Others:
Fixed variable names to stop reassignment.
Updated: copyright comments.
Merge branch 'develop' into spike
Modified Exception type.

Others:
Fixed variable names to stop reassignment.
Updated: copyright comments.
Merge branch 'fix' of https://github.com/trashtoy/PEACH into fix
Merge branch 'fix' of https://github.com/trashtoy/PEACH into fix
Merge branch 'fix' of https://github.com/trashtoy/PEACH into fix
fixed #1

Detail:
- Modified containsKey from isset() to array_key_exists()
Merge branch 'fix' into develop
Added Markup module.

- All classes and incomplete unit tests.
Added: Peach_Markup_None
Merge branch 'spike' of https://github.com/trashtoy/PEACH into spike
Implemented tests for Container classes.

- Added Peach_Markup_ContainerTestImpl
- Implemented tests using ContainerTestImpl
Modified Peach_Markup_NodeList

- Fixed comments
- Removed appendNode (Integrated with 'append')
Modified comments for Peach_Markup_Container.
Added Peach_Markup_NoneTest
Removed CDATA section support

Others:

- Modified comments
- Implemented tests for Renderer classes