Added OneNote as a host to taskpane and content add-ins

[MADLinsen]

Added OneNote to the taskpane and content indexes and updated taskpane/content tests to test for OneNote as a host

[msftclas]

Hi @MADLinsen, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.microsoft.com.

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[coveralls]

Coverage remained the same at 98.287% when pulling 2d486e0 on MADLinsen:master into 3112745 on OfficeDev:master.

[msftclas]

@MADLinsen, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, MSBOT;

[jthake]

Merged into dev and pushed to master