Fix incorrectly matching comments in jsx body

Related to babel#226

Add comment.block.documentation to new syntax

Merge pull request babel#199 from babel/post-flow-4-fixes

Post flow backport pt.4 fixes

Merge pull request babel#198 from babel/flow-backport-4

Flow backport (part 4)

Merge pull request babel#193 from babel/flow-backport-3

Flow backport (part 3)

Fix `false` matching in old syntax.

Fixes babel#188

Merge pull request babel#187 from babel/flow-backport-2

Flow backport (part 2)

Revert "Combine a few function rules"

This reverts commit b044564. This seems to be causing Sublime to crash with certain minified files. See babel#185

Merge pull request babel#184 from babel/flow-backport

Flow backport (part 1)

[experiment] try to differentiate between obj and block