add editorconfig to keep js file format

refactor common utils into separated files

refactor: create mixed depper class for both asyn and sync

fix inline cwd use internal instead of process.cwd

refactor migrate inlineSource and inlineName to mixed depper class

refactor migrate inline logic to mixed depper class

refactor migrate transform logic to mixed depper class

refactor migrate resolveTransform logic to mixed depper class

refactor migrate applyTransforms logic to mixed depper class

refactor migrate readFile logic to mixed depper class

refactor migrate getTransformsForFile logic to mixed depper class

remove unused variable

prevent variable shadowing in resolveImports

refactor migrate logic getImportName from resolveImports

remove unused requires

refactor migrate extractPreprocessors from add method

split add logic migrating _resolveImports into internal method

remove useless self reference add method

create internal method _addDep

remove unused require tokenize

update depper interface docs

allow transformResolve option with sync/async behaviour

update glslifyDeps option docs

docs update jsdoc api documentation

refactor create intermediate class for node enviroment

interface _addDep method

rename transform-resolve to transform-require according to its logic

mix async/sync readFile option

fix missing flow check in selectTransform

add async and sync members to mixed functions

refactor __addDep allow extra options

migrate glslResolve to NodeDepper

migrate readFile to NodeDepper

migrate transformRequire to NodeDepper

depper sort option assignment

add asyncify function to handle async and sync flows

migrate getTransformsForFile to NodeDepper

refactor migrate NodeDepper.add to Depper.add

refactor migrate this._cwd logic to NodeDepper

simplify module exports

change sources syntax to es6

change test syntax to es6

change depper and utils syntax to es6

apply lint standard javascript

apply lint javascript standard for unresolved warnings

update modules and set babel build script

use spread array vars for asyncify

migrate file cache to NodeDepper

fix glslify tricky way to call applyTransforms