changing way songs are stored on firebase so they can be pulled down and listed as well as their sequences incorporated into songs being modified
Major modifications toward having song lists

* Added User constructor
* To Firebase storage to allow songs to belong to users
* To allow users to modify any channel of a song
* Updated password fields from text to password type
* Fixed bugs with login/user creation
* Changed sequences format from hash of hashes to array of hashes
* Songs still aren't listing
Song lists now working

* New CreateNewSong function that asks user for name and checks FB for duplicates (dup checking isn't working)
* New PrintSongList function to handle displaying of both public and user lists
* Adding to FB list of songs and updating user list of songs only happens when creating a new song
* Bug: clicking on a song or note button causes cycling through of functions a number of times equal to number of songs
Fixes bug in checking FB for duplicate song name when creating new song
Merge pull request #19 from artfoundry/song-list

Song list