Typo fix: UInt8Array -> Uint8Array
Merge pull request #52 from toyoshim/Uint8Array

Typo fix: UInt8Array -> Uint8Array
Renames, constructors for events.

This fixes issue #51, issue #50, and issue #1.
Moving security section down in the doc, moving actual API up.
Fixed Event constructors.
Change to use Futures for requestMIDIAccess (fixes issue 49)
Added sysex example.