Merge pull request #16 from sandyphan/master

Updated on tutorial sample page
Fixed when a check at zero was done before the first frame render
Merge branch 'master' of https://github.com/StephMc/web-animations-test-framework
added a small paragraph on how to create a simple animation with explaination of each component in the line of code
separated styles and js scripts into different files called tutorialStyle.css and tryItYourself.js
added a main page title to page, subtitle for the section with style applied, made everything to the center and made the try it yourself block smaller
added a first exercise into the page, made another sub title for exerces and styled it
add a second exercise into the page as well as a corresponding try it yourself editor where problems now happen. the original js script does not read collect data or input data from/to the second editor
added a solution div which still needs to work on toggling through js
add toggleSolution() function ins js, works if display of originally the code block is 'block', not working for display of original code block is 'none'
commented out the editors, just focus on the contents
commented out toggling solution, fix that later