Merge pull request #173 from drount/master

Avoid small scroll while paused seeking. Added parameter handlerSize.
resolves #170; use BufferSource by default; use MediaElementSource for streaming
set playbackRate dynamically (as it used to be)
don't clear innerHTML
add separate ex.fm example; use wav file in render-as-it-plays example (for Firefox)
add ex.fm example link on index page
rn ex.fm example link from index page
restore loadBlob, loadDecodedBuffer
#175 playBackrate -> playbackRate
Handler are now div/css elements. Fixed recenter bug
Fixed noise while seeking