Add support for experimental-html-handler.

Small diff which allows library users to override the el.innerHTML assignment.
Useful when special behavior is needed.
Merge pull request #90 from PhilHarnish/experimental-html-handler

Add support for experimental-html-handler.
Release the unified extraction experiment and remove the old legacy code.
Merge pull request #91 from DavidCPhillips/release-unified-experiments

Release the unified extraction experiment and remove the old legacy code
Add spfreload parameter to reload requests fired from an SPF reload.
Merge pull request #92 from DavidCPhillips/spfreload

Add spfreload parameter to reload requests fired from an SPF reload.
Fix missing vars in url.js
Merge pull request #93 from DavidCPhillips/fix-vars

Fix missing vars in url.js
Experiment when using the init time as the basis for navigation lifetimes instead of the last navigation.
Merge pull request #95 from DavidCPhillips/init-vs-nav

Experiment when using the init time as the basis for navigation lifetimes instead of the last navigation.