Fixes #165 by displaying an info box if WebGL is not detected
Hides everything but text box if WebGL is disabled. The text box is also updated to include a logo and more text.
Fixes some phrases and adds sources for information.
Adds the browsers supported and more instructions in the text box that appears when WebGL is disbled.
Merge pull request #186 from jacksonchen/issue_165

Fixes #165 by displaying an info box if WebGL is not detected