Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Update README file for first release
Table of contents

Add possiblity to generate the TOC from the markdown document to the discount wrapper.

issue #1
Table of contents

* emit result signal for TOC from HTML preview generator
* add dockwidget to mainwindow
* show table of contents in a webview

issue #1
Merge branch 'feature-toc-#1' into develop