Tracking performance metrics

Here's where we'll track performance and size metrics for ongoing versions of the player. The purpose is to evaluate how the decisions we're making are impacting on these values over time, and better decide on what to optimise for.

Version	Date	Significant change	Bundle size	Playback failure rate	Average startup time
0.0.1	?	?	?	?	?
0.0.2	10/02/18	Integration with clappr	10.xmb (@ya7ya help specify plz)	?	?
0.0.2	20/02/18	https://github.com/Paratii-Video/paratii-portal/issues/194#issue-298619300	8.5Mb	?	?