XmlPeek Documentation: default namespace case

Just put a note in the XmlPeek documentation so it is known that for default namespace the namespaces declaration is also required.
Removed unused using directives
Added missing documentation
Introduced BaseBuildAttribute
Added missing documentation
Added missing documentation
Added missing documentation
Merge pull request #118 from katlimruiz/master

XmlPeek Documentation: default namespace case
Add missing /para tag to XmlPeekTask comments.
Merge branch 'master' of https://github.com/embedev/nant into embedev-master

Conflicts:
	src/NAnt.Core/Project.cs
Merge branch 'embedev-master'
Merge remote-tracking branch 'upstream/master' into issues_64_85

Conflicts:
	src/NAnt.Core/DirectoryScanner.cs
	src/NAnt.Core/Types/FileSet.cs
	src/NAnt.Core/Util/FileUtils.cs
	tests/NAnt.Core/DirectoryScannerTest.cs