first round of switching rule modifications to make more robust and more tunable
added throughput based rule and removed download ratio rule for now. Further tweaks to buffer based and limit rules.  Tweaks for dynamic streams.
fixed rebase errors
switching rule changes.
modifications to switching rules.
jshint errors fixed.
adding imports to index.html
switching rule changes post review - minor change
changed buffer target location from rule to buffer controller still stored in VO bufferState.
Adding small bug fix before I merge into dev
Merge pull request #332 from AkamaiDASH/ABRRules

Changes in the Switching rules.