Structure chapter: Move the "read on" motivation to the very end
Add section in the first chapter about HTML comments (addresses Issue #14)
Add note about path/to/your.css - addresses Issue #14
Add section on images to the HTML structure page, refer back to it from CSS page (addresses Issue #14)
Add a link to the CSS cheat sheet where we refer to it
Add note about refreshing in browser (addresses Issue #14)
Rename page-title id to first-heading (addresses Issue #14)
Fix typo of UTF-8
Add a basic introduction to Web Console / Developer Tools to foreshadow its use in the styles chapter (addresses Issue #14)
Move the browser console style off to an Extras section, remove the browser tools reference in the CSS chapter (keeping with the feedback in #11)
Merge pull request #15 from OpenTechSchool/issue14

Some changes for Issue 14