Add ability to install via npm#2

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VanDavv wants to merge 7 commits intojledet:masterfrom

Commits on Mar 28, 2019

Add package.json file to be able to install from npm
Łukasz Piłatowski
committed
add npm install option
Łukasz Piłatowski
committed
Make useable from node environment
Łukasz Piłatowski
committed
remove unnecessary package.json scripts
Łukasz Piłatowski
committed
add package-lock.json
Łukasz Piłatowski
committed

Commits on Mar 29, 2019

Support ticksHz option to control amount of displayed ticks in horizontal axis
Łukasz Piłatowski
committed

Commits on Apr 1, 2019

Add ability to specify horizontal axis position
Łukasz Piłatowski
committed