v2.7.0

Changes:

• Support flow type imports (including finding the exports) (@rndmerle)
• Improve messaging when imports are added
• Update Meteor environment to support api.mainModule (@coagmano)
• Allow coexistence of homonymous named and default exports in same module (@rndmerle) (requires updates to editor plugins, which will come later)
• Take variable hoisting into account when finding undefined variables
• Add sortImports to known configuration options (@dabbott)