dynamic sticky count supported & npmignore updated

• sticky count props can now be updated from values like 1, to 2, back to 1, and css properties derived from "sticky insets" will always be set properly
• our new npm publish list:

npm notice 1.1kB  LICENSE      
npm notice 19.5kB dist/index.js
npm notice 41B    index.js     
npm notice 2.7kB  package.json 
npm notice 3.6kB  README.md