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)