Push to_xml_params down to ApplicationController
Rename to_xml_params to todo_xml_params
Revert "Cache the project and context names"

This reverts commit 610152b8ddf1e996c47047ce6f4d6c4576e7e800.
Revert "Use an attr_reader for attributes"

This reverts commit 6376bd7ef655211ac8e3454981f0d6ee208e0156.