Qcm-parser

What's Changed
* Simplify modes by qkzk in https://github.com/qkzk/qcm_parser/pull/1

**Full Changelog**: https://github.com/qkzk/qcm_parser/compare/v0.1.1...v0.1.3

Private names and property.
Use private names for non exposed attributes.
Use property for exposed ones.

This is a breaking change :

`QCM_Question` now have attributes :

* `title` instead of `question_title`
* `text` (doesn't change)

`QCM_Answer` now have attributes :

* `title` instead of `text`

Naming is now consistent : `ParseQcm`, `QCM_Part`, `QCM_Question`,
`QCM_Answer` all have a `title` attribute.

Doesn't escape title and part title.

Don't use `html` anymore

First working release.