Block Parser testing, removing placeholders, and looping through block.
Block processor fully functional.
paragraph-like line-spacing
minor refactor
Refactored start/end.
refactored start/end

subsume _is_spanmode into _process_html_block

removed duplicate end definition

rename duplicate variable
Nose test for default span mode.
typo fix
Merge branch 'master' of https://github.com/ryneeverett/Python-Markdown