Atom IDE support for Flow

Adds several IDE features for Facebook Flow language to Atom:

Hover tooltips show type information when over variables
Typecheck on save reports errors with red highlights and gutter indicators
Go to definition command navigates to the definition of a variable
Autocomplete shows type-based completion lists [NOTE: Must install autocomplete-plus plugin]

Heavily inspired by IDE Haskell.

Demo

$ apm install ide-flow

If the flow command is not on your path, set its location in the package settings under Flow Path
Automatically starts a flow server if not already active in a given folder.
If you need to set configurations on the flow server (such as a --lib flag), run a server manually in the folder you are working in.