* Remove 'use strict' from all files
* 'use strict' removed from pacakges' sources
* Strict mode is now enabled automatically by babel
* 'use strict' check removed from dangerfile
* Updated contributing guidelines
* Enable @flow for most files
* Commit yarn.lock
* Revert removal of "use strict" in test and mock files
* Improve annotations for ReportDispatcher
* Replace "void 0" with "undefined"
* Update babel-plugin-transform-strict-mode to match transitive deps
Summary:This gets Jest ready for 0.9.0.
What's new?
* Slightly refreshed look, based on the Relay website.
* New summary of what Jest is on the website.
* New Getting Started guide, with babel support and key feature explanation.
* Added a troubleshooting section.
* Updated all examples in the documentation.
* Added all new APIs to the API docs, updated everything to use `jest.fn()` instead of `jest.genMockFn()`.
* Removed the webpack alias and coffeescript guides. Neither of them are really supported or useful at this point. We can bring back a guide later on proper webpack integration if someone in the community takes this on. The webpack-alias feature is handled by the `moduleNameMapper` API.
* Added a link to the `Failed to get metadata` error in Jest.
See http://cpojer.github.io/jest/ for a preview.
In a follow-up I'll add a section on async testing for Promises and some more info about automocking.
Closes https://github.com/facebook/jest/pull/763
Reviewed By: yungsters
Differential Revision: D3005361
fb-gh-sync-id: f8e634cf4a311764f311f8b5849781b53975e686
shipit-source-id: f8e634cf4a311764f311f8b5849781b53975e686
Paul O’Shannessy