Update jstransform version to ^7.0.0
(cherry picked from commit c260c45db31d550f914c626ed484a9d40e70f43f)
Remove esprima-fb and use Syntax from jstransform
(cherry picked from commit bf0a857a9296046552c771ed983fd7e4761f894f)
Update stripTypes transform to use fixed up jstransform transform

(cherry picked from commit 0d308add09df27456d2cd0bf99848d43b0115388)
Re-shrinkwrap dependencies with new package.json

After running `npm install` with the old shrinkwrap, I ran:

```
rm -rf npm-shrinkwrap.json node_modules/esprima-fb/
npm install
npm install envify@3.0.0
npm shrinkwrap --dev
```

and ended up with this file. (I had to re-install envify because it wants jstransform@'^6.1.0' but was getting the one at the root which is now `8.0.0`. Now it uses its own copy in `node_modules/envify/node_modules/jstransform/`.)
Merge pull request #2543 from spicyj/strip-types-2

Cherry-pick jstransform, strip-types upgrades and re-shrinkwrap