Allow 0 value for pageX
chore(editorconfig): add indent size 2 for *.yml
chore: add .travis.yml
chore(pkg): add scripts test cmd

Used for e.g. travis.ci etc.
chore(ci): add grunt-cli as dependency
docs: add travis.ci build status badge
refactor(css): remove invisible box-shadow

Remove invisible white box-shadow from `.rangeslider` and
`.rangeslider__fill`.
Merge develop into mwean-develop
Merge branch 'mwean-develop' into develop

* mwean-develop:
  Allow 0 value for pageX
refactor: getRelativePosition pageX

* Mainly style
* add pageX default value 0
chore(release): v0.3.6
Merge pull request #100 from andreruffert/release-0.3.6

release: 0.3.6