- Fixed bug, in get call

	modified:   lib/riyic/api.rb
New gem api methods:
 - build_node(name, &block) -> create a new node
 - enable_debug -> activate debug

	modified:   lib/riyic.rb
	modified:   lib/riyic/attribute_mixin.rb
	modified:   lib/riyic/colorized_strings.rb
	modified:   lib/riyic/exec.rb
	modified:   lib/riyic/node.rb
	modified:   lib/riyic/shell_mixin.rb
	modified:   test/test_node.rb