Fix deprecated web-audio api:
GainNode.gain.value instead of AudioBufferSourceNode.gain.
AudioBufferSourceNode.start() instead of AudioBufferSourceNode.noteGrainOn().
AudioBufferSourceNode.stop() instead of AudioBufferSourceNode.noteOff().
Fix web-audio api checking. Use window.AudioContext instead of window.webkitAudioContext
Fix for lower compatibility of webaudio api.
Merge pull request #234 from kumabook/fix-webaudio

Fix webaudio
retab
bugfix about DOMSound that had dispatched load event more than once (#235)
Merge branch 'hotfix/#235'
fix android JSON.parse(null) bug

    bug fix for Andoid JSON.parse bug

    error message is

    ```
    Uncaught illegal access at file:///android_asset/www/plugins/memory.enchant.
js:667"
    ```

    See also for same bug

    Android + JSON.parse(NULL) = Uncaught illegal access · Issue #48 · brianlero
ux/lawnchair
    https://github.com/brianleroux/lawnchair/issues/48

    in Japanese
    http://metamosoft.hatenablog.com/entry/2013/06/16/143156?_ga=1.145227508.159
6586333.1367849780
Merge pull request #255 from hshimo/fix/androidJsonParseBug

fix android JSON.parse(null) bug
Merge branch 'develop'
Merge branch 'develop'
fix bug #265
Merge pull request #266 from wise9/hotfix/core#load

fix bug #265
fix unbinding bug
Merge branch 'develop'
Revert "modify Node#_updateCoordinate"

This reverts commit b1d528e571340a89429d7896b3bc5c27a9b70bcf.
Merge branch 'hotfix/update-coordinate'
Merge branch 'master' into develop