Adding multilevel buffer management to BufferExtension.js and changes to BufferController.js to support this change.
Removed y-axis max value for chart to allow for autoscaling buffer values.
Added Akamai logo to contributors section of dash player index.
Removed y-axis max value for chart to allow for autoscaling buffer values.
Added Akamai logo to contributors section of dash player index.
Added two stage validate interval. Faster at startup slower cycle once buffer is stable. 
Fixed init issue race condition in buffer extension
Added delay back into the shouldBufferMore decision.
Change validate timer back to state before multilevel buffer was introduced. But I kept it a new method so I could separate the setting of the minBufferTime for startup from the validate timer interval being set if minBufferTime is present in the manifest. 
Pass in type so I can get the proper metrics to determine if we are playing at top rendition.
Fix code to work with latest dev branch rebase.  Just minor changes. 
Went back to only getting metrics for video since we should not buffer audio to a larger value if we are not going to buffer video so this keeps them inline with each other.