Following esprima harmony branch

[Constellation]

Add esprima harmony code generation.

[mathiasbynens]

https://bugzilla.mozilla.org/show_bug.cgi?id=913301

[Constellation]

Probably, some ES6 syntax are fixed enough. So it's time to start this issue!

[stefanpenner]

@Constellation is this the appropriate place to request es6 module syntax or should I open a second ticket?

[Constellation]

@stefanpenner:

We track ES6 on this issue. Could you file issues for each AST node that escodegen lacks?