update dependencies
update gulp tasks
fix env-table layout

  - [ duration, value, curve ] -> [ value, duration, curve ]
add $("env") _ syntax
fix $("env") default curve 0.01 -> 0.05
add $("line") _ syntax
fix $("bandpass")
v0.0.17
Merge pull request #20 from mohayonao/v0.0.17

v0.0.17
Merge branch 'master' into gh-pages
build v0.0.17