Merge pull request #2 from lgarron/master

[all-permissions] Add web MIDI API and fix notifications callback.
Request sysex for MIDI.

http://webaudio.github.io/web-midi-api/#idl-def-MIDIOptions
Merge pull request #3 from lgarron/midi-sysex

[all-permissions] Request sysex for MIDI.
Avoid fullscreen border by removing body padding.