created intervals route and moved header and footer to partials
created intervals route and moved header and footer to partials, added Tones constants
added the transpositions list
#28 added hide enharmonics
#28 added layout for intervals
#28 added transcluded title for notes
Added option to play the interval (tonic + transposed tone)
Added note attribute to play the interval (tonic + transposed tone) at a given timeout (in ms)
#28 Fixed styling
closes #28 Added intervals page
Merge pull request #33 from fmquaglia/intervals-page-28

closes #28 Added intervals page