Continued work on Introduction to WordPress lecture.

* Completed "WordPress is Born" section
* Began outlining significant events section
Completed significant events section.
Added two more sections to first lecture.
Add community information.
Complete Up and Running lecture.
Finish tour inside WordPress lecture.
Reorder first lecture.
Add community resources.
Add reveal.js files and first lecture slides.
Change file name.
Add a tour inside WordPress lecture.
Merge branch 'week-one'