Make react-mde great again

[andrerpena]

Draft.js:

• Adds almost 400KB to the bundle size.
• Will commemorate 1 year without updates on January 20, 2019. Facebook most likely does not use it in prod.
• Does not work on Mobile Chrome. Editor broken on Android (using Chrome) #111
• Probably has issues with with Preact. Cursor jumps with pre-set value #142

The reason why I migrated to Draft.js is stated here #84 but it was not a good idea at all. I'll go back to make it work without dependencies as soon as I can. That will include FontAwesome.

[andrerpena]

7.0.0 TODO list

• Eliminate Draft.js
• Eliminate the dependency to font-awesome
• Evaluate all the dependences and evaluate whether or not it is possible to make react-mde zero dependencies

Intermediate TODO (Tasks to be executed during the migration)

• Decide what to do with the Tab command. Stackoverflow and Github don't support it.
• Evaluate what to do with keyboard commands.