remove gulp-browserify, use browserify instead
fix gulp tasks
remove web-audio-mock, use web-audio-test-api instead
update devDependencies
add npm scripts
use `npm run travis`
v0.2.6
Merge pull request #6 from mohayonao/v0.2.6

v0.2.6
Merge branch 'master' into gh-pages
build v0.2.6