fix: new resize strategy for octet resizing

Release version 2.0.1

Fix npm postinstall script

2.0.0 Release

Breaking change, use promise instead of callback
A new demo site released
Add an angular website
Use travis CI
and many other things

replace grunt by gulp
replace jshint by eslint
add example site in the source for easy dev
and so on

Release 1.0.2

Add outputFormat option

Add posibility to choose output image format

Version 0.9.2 - angular dependency

Correction of un bug minification