Use proper parser

[DavidLeoni]

Currently parsing seems to be done by means of regexes --> bad thing!

Instead, we should use a proper parser. Alternatives found so far:

parsoid

• parser used for Visual editor of Wikimedia
• works in NodeJS
• TODO does it work in browser?
• mainly parses to HTML

wtf_wikipedia

• works both in NodeJS and browser
• according to the author creates proper json structure, while Parsoid doesn't

RemexHTML

• new official PHP parser, replaces old one called Tidy

Maybe we could use WTF to get structured json so to have an easy structure for mindmaps , while we could use Parsoid for creating HTML to display in tooltips