Fix: test case firefox support
Fix: test case media type
Add: vendor prefix support except webkit
Fix: removeEventListener
Fix: add webaudio available information

For browseres have no `webkit` prefix
Add: ie support
Fix: test case ie support
Merge branch 'develop' of github.com:CyberAgent/boombox.js into develop
Add: cache whole files
Add: test for cache
Changed: make cache for Array.prototype.slice
Add: console.trace
Fix: do not fire ended event when using webAudio mode with iOS6
Merge branch 'develop' of github.com:CyberAgent/boombox.js into develop
Add: ignore jekyll
Add: logo files
Add: logo image
Fix: fix path
Add: browser correspondence_table.md
add time stamp