fix: fix sroll change detection

fix: improve detection of external scroll

'floor' raw scrollPosition when checking for scroll change (codepen returning floating values)

refactor: improve api

* chore: fix promise issue using cypress

* refactor: improve public api

BREAKING CHANGE: api changed

* feat: improve public api

merge scroll functions into scrollTo

* test: add browserstack tests

replace cypress with browserstack for better browser support

Squashed commit of the following:

commit 9f91793ff5a2a46d7b217c5cc0b4e195f99d803e
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Mon Apr 29 00:08:58 2019 -0400

    test: improve tests

commit 4dae7a7
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Sun Apr 28 22:59:28 2019 -0400

    test: change to TDD

    change 'describe' for 'suit'

commit db8bfab
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Sun Apr 28 20:44:33 2019 -0400

    test: improve tests

commit 5f6ca6b
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Sun Apr 28 18:40:11 2019 -0400

    test: remove cypress

commit f0af97d
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Sun Apr 28 18:36:34 2019 -0400

    test: add basic scroll test

commit 34fef3c
Author: David Perez Alvarez <david@leddgroup.com>
Date:   Sun Apr 28 17:45:34 2019 -0400

    test: basic browserstack test config

* chore: remove yarn.lock

* chore: new api

* feat: add getElementPlacement

* fix: proper handling of scroll to element "percent"

* chore: use scrollSize as avaliable scroll instead of scrollSize

* fix: scrolling in document element

* perf: replace ScrollElement class with functions

* refactor: remove unnecessary getters

* refactor: change detection of external scroll

* perf: not removing all scroll animations

* fix: scrollSize getter

* fix: make tests use new api

* refactor: move "element" function logic to 'ScrollElement'

* fix: remove browserstack scripts returning cyclic structures

* test: improve centerElement test

* refactor: improve api

* docs(wip): update readme

* refactor: rename elementRelativePosition => relativeElementPosition

* docs: update readme

* test: update test for elementPosition

* test: use min capabilities test

* fix: getDistToCenterElement not working

* fix: update properly animation position after user scroll

* fix: test capabilities

* test: reduce precision

* refactor: fix codeclimate issues

* docs: add browserstack logo

fix(readme): fix 'element' examples

fix(readme): incorrect external onScroll example

v3 greater refactor (#43)

BREAKING CHANGE: api changed
* chore: change exported api

* refactor: change animationManager

* chore: remove demo

* docs: update readme

* docs: update readme

* feat: add `misc`

* refactor: remove tests

* feat(misc): add `scrollTo` function
similar to `scrollBy`

* feat(misc): add `isElementInRange`
returns `true` if element is visible from its container #14

* docs(readme): fix typo

"design" -> "designed"

* fix: missing module in package.json
ts-node

* test: add cypress
Squashed commit of the following:
    test: add screenshots for readme
    test: refactor tests
    test: add basic cypress tests

* refactor: change position to scrollPosition

* docs: update README

* chore: remove browserstack

docs: fix README

fix: allow `document.querySelector` to instantiate ScrollManager

change `HTMLElement` to `Element`
`HTMLElement` extends `Element`

fix: remove react-markdown from dependencies

docs: add badge for npm downloads