update test for base64
add .editorconfig
refactor index.js
rename main.js > main_spec.js
add url data module
add check empty to to data url module
add WebpBase64 functionality
fix extract method
simple implement convert utility
refactoring
update
update tests
test webp functionality
implement to Webpcss urldata module and update + refactoring main_spec tests
implement sync version of convert
add WebpBase64 support for Webpcss
add POC for cwebp
update read me
remove dead code
jshint fixes