seeking seconds by default

• updates hlsjs to v0.3.3
• fixes CI and send data to coveralls
• increases overall test coverage and documentation
• adds seekPercentage to all the playbacks and player
• adds playbackNotSupportedMessage options to message be shown when the playback is not supported
• fixes localStorage setting's persistence bug #677

Changes to API

-setCurrentTime(timeInPercentage)
+seek(time)
+seekPercentage(percent)

-player.seek(timeInPercentage)
+player.seek(timeInSeconds)

new container events

Adds two new events to container:

• CONTAINER_MEDIACONTROL_HIDE
• CONTAINER_MEDIACONTROL_SHOW

standardize events

• fixes (partially) hd indicator not showing up #682
• standardize progress, timeupdate, loadedmetadada and playbackstate events

Changes to event API

-    this.trigger(Events.PLAYBACK_PLAYBACKSTATE)
+    this.trigger(Events.PLAYBACK_PLAYBACKSTATE, {type: this.playbackType})

-    this.trigger(Events.PLAYBACK_LOADEDMETADATA, duration, loadmetrics)
+    this.trigger(Events.PLAYBACK_LOADEDMETADATA, {duration: duration, data: loadmetrics})

-    this.trigger(Events.PLAYBACK_TIMEUPDATE, position, duration, this.name)
+    this.trigger(Events.PLAYBACK_TIMEUPDATE, {current: position, total: duration}, this.name)

-      this.trigger(Events.PLAYBACK_PROGRESS, 0, this.el.getBytesLoaded(), this.el.getBytesTotal(), this.name)
+      this.trigger(Events.PLAYBACK_PROGRESS,{
+        start: 0,
+        current: this.el.getBytesLoaded(),
+        total: this.el.getBytesTotal()
+      })

more events and some fixes

• fixes: media control, dvr sliding window, getDuration for hlsjs, destroy method on hlsjs
• clappr is no longer available at window.p
• updates: documentation and readme
• adds the 'parent' option
• dispatches PLAYER_VOLUMEUPDATE event
• adds getVolume method
• adds context menu event