Added DEFAULT_HEIGHT
Put fixed width for unittest div
Enabled toggle on toolbar buttons
Added more Constant
Added current_clef and few aliases
dur probably is a better nam
New stuff in tmp.html
Added utility functions
Toggled toolbar current values
Tried some stuff in tmp.html
Added accessors and default values

Added accessors for:
    o current_clef
    o current_key_sig
    o current_time_sig

Added default values of:
    o DEFAULT_CLEF
    o DEFAULT_KEY_SIG
    o DEFAULT_TIME_SIG

Also added valid_time_signatures.
Fixed documentation errors
Toggled left nav buttons based on current values