Refactor, added Classic User TImings, added duplication configs, added docs

[DanWilkerson]

Refactored core code to use a single handler for dispatching hits (dispatchGaHit) and remove the need to check the version in each individual api handler. Changed the model to format every hit in the UA style and then transpose to the Classic style in the handler.

Added a configuration option to specify which hits to duplicate/not duplicate. Defaults are set to mirror current default behavior.

Bumped minor to 0.3.0. Will need to re-bump if #67 is accepted before/after.

Should close #46, #69, #70, and #26.

[timelf123]

Whoops, merged the transaction one already. LGTM after conflicts solved. Can these two just share the same minor?

[DanWilkerson]

@timelf I'd like to adjust the ecommerce code to use the same dispatchToGa and additionalAccountsHitTypes w/ this PR. Can I push another commit tonight without bumping, you think?

[timelf123]

Sounds good to me since we haven't published anything to npm or pushed any tags

[DanWilkerson]

Dug myself in a bit of a hole here without realizing it - may take another day to get this ironed out.

[DanWilkerson]

Okay, take a look and let me know if it's good to merge in @timelf123

[timelf123]

Still conflicts with master @DanWilkerson

[DanWilkerson]

Whoops, so there are. Fixed and merged!

[timelf123]

Does this need to be built/tagged/published?

[DanWilkerson]

Yes, does need to be published - I rebuilt before pulling this in, though. I have a release drafted with these notes: v0.3.0

• Added Ecommerce tracking
• Added support for multiple trackers for all hit types
• Retooled Custom Dimension iteration and added support for CDs on Pageview hits
• Refactored code to use dispatchToGa handler

LGTY? I can publish immediately.

[timelf123]

LGTM @DanWilkerson

Nice work