(feat) add standalone browser version (iife)

[bobaaaaa]

What

• create a new ES5 transpiled version for browsers only (dist/sticky-observer.js)
• includes the namespace sticky (only for the browser version) 😞
• add a simple demo index.html

Fixes #7

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   96.56%   96.56%           
=======================================
  Files           7        7           
  Lines         233      233           
  Branches       33       33           
=======================================
  Hits          225      225           
  Misses          1        1           
  Partials        7        7

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[bavarianbytes]

Was it your intention that there is no dist/sticky-observer.js?

[bobaaaaa]

git clone git@github.com:spring-media/sticky-observer.git
cd sticky-observer
yarn install
yarn build
ls dist/

[bavarianbytes]

Thx, wouldn't it be a good idea to included an ES5 compiled version in the package, like most other packages do? Therefore users can use it via dependency tools like npm without any need do run certain build processes.