Changed the link in the README to GitHub Pages
Moved the "about" text into the README
Made the measureCounter count actual measures

Previously, the measure counter counted beats, incorrectly counting
each measure as four measures.
Reduced the size of the grid by 50%
Made the piano shorter
Removed the text from all notes except C

Also, made the text on the C key centered.
Merge branch 'master' into gh-pages