updated lessArcane.js

updated to explicitly call Prism

added data-manual, so prism MUST be explicitly called
pulled from pigeonflight

_

Keep forgetting to 'compile' the coffeescript into js. Would be usefull to look checkout if a hook could be implemented to run coffeescript on git commit.....
updated README;preprocessed sample.json into sample-processed.json to support newlines
added descriptions to the snippets
updated readme and sample.json file
updated .gitignore