Improve Clappr 0.4.x compatibility - #21

Thanks @bp2008 🎉

v0.6.0

Restores the backward compatibility with Clappr 0.2.x and make it work again with latest.

Major changes :

Playback rates are internally handled as Number
Added player external interface getPlaybackRate and setPlaybackRate methods
Removed MEDIACONTROL_PLAYBACKRATE from #3 (supersede by external interface)
upgraded all dependencies to latests (Webpack to v4)
Added code lint npm tasks (npm run lint)
Added local dev. server npm task (npm start)
To compile unminified es5 : npm run build
To compile minified es5 : npm run dist
Added release npm task to run lint and compile all (npm run release)
Updated documentation

Thank you @kslimani

v0.5.1

• remove test runner (it had vulnerable sub-dependencies and we weren't using it)

v0.5.0

• Fixes for latest clappr v0.3.0 and style tweaks - #13 (thanks @chriswiggins)

v0.4.0

• updates to webpack 3 - #11
• fixes double-bundling problem - #10

Thanks to @mgambati!

v0.3.2

• adds support for playback rate changing on audio elements (fixes #9)

v0.3.1

• Fixes issue settings active class (thanks @ludov04!)

v0.3

Fixes issue #5

v0.2

• adds event to set rate programatically (solves #2)

Thanks @iongion!

v0.1.4

remove window pollution; hack on the entrypoint some more