Rename livedata to ddp, meteor test-packages passes
Update docs and update jsdoc ignored paths
Merge branch 'release-0.9.1' into ddp

Conflicts:
	packages/livedata/package.js
Rename livedata package to ddp

Summary: What's on the tin

Test Plan:
meteor test-packages passes
meteor self-test passes

Reviewers: dgreenspan

Reviewed By: dgreenspan

CC: avital, emily, nim

Differential Revision: https://phabricator.meteor.com/D789