Modified jsonPointer to create an empty Array for new integer key
flagrate.jsonPointer: for reliability - NOTE: now flagrate.jsonPointer.set() allows null value and use undefined to delete value.
related: 4d51553311988149a23a77b94f539e51160a2aa3
Merge branch 'master' into gh-pages by CicleCI
Build 'flagrate.min.js' and 'flagrate.min.css'
Build API documentation