Revert "Attempting to force use of esprima harmony version"

This reverts commit 0fe7491ff7ac9088db5faeee912bbdf4d7dbe5f6.

No need to branch dependent versions because I can use npm shrinkwrap.
Revert "Upgrading javascript editor to use custom version with ES6 validator"

This reverts commit c7690cb003a91391403aa7a41e40480eabe7810a.

No need to branch dependencies because I can use NPM shrinkwrap.