Investigated issue #4
Line breaks do work, Markdown by default allows just one line break, any additional lines manually inserted is ignored. You can however insert html tag <br /> for additional breaks.

During the investigation it was apparent that more spacing is needed, this is now added in the css
- More space before after h1,h2,h3, hr, ul, ol
- Pre formatted code block is now formatted github style
- inserted css selectors to make sure that theme css does not override manual manager css styling, it has done that from time to time (the new lightTheme for example hide the hr tag).