comments in write-only codebox caused irregular linehe height, resulting in mismatch between line numbers and lines. also scroll bars
moved some ofthe code-styling scripts to bottom of b body to improve page-load time
found a bettwe way of creating code  blocks using <pre> elements. Also made it so the padding on the interactive code block more clearly mirrors that of the write-only codeblocks
Merge pull request #249 from silshack/code-mirror

Rejiggered the code-mirror code-blocks a bit