Allow testing against local auth stack

Summary:
This commit changes how N1 parses config.cson very slightly
so that when "env" is set to "local" N1's auth flow can be
tested against local copies of Nylas' auth servers.

Test Plan: I tested it manually against a local auth stack. It worked!

Reviewers: bengotow

Reviewed By: bengotow

Subscribers: kav-ya

Maniphest Tasks: T6690

Differential Revision: https://phab.nylas.com/D2671

src/flux/edgehill-api.coffee

@@ -17,7 +17,7 @@ class EdgehillAPI
 
   _onConfigChanged: =>
     env = NylasEnv.config.get('env')
-    if env is 'development'
+    if env in ['development', 'local']
       @APIRoot = "http://localhost:5009"
     else if env is 'experimental'
       @APIRoot = "https://edgehill-experimental.nylas.com"

src/flux/nylas-api.coffee

@@ -156,7 +156,7 @@ class NylasAPI
       @AppID = 'c5dis00do2vki9ib6hngrjs18'
       @APIRoot = 'https://api-staging-experimental.nylas.com'
     else if env in ['local']
-      @AppID = 'n/a'
+      @AppID = NylasEnv.config.get('syncEngine.AppID') or 'n/a'
       @APIRoot = 'http://localhost:5555'
     else if env in ['custom']
       @AppID = NylasEnv.config.get('syncEngine.AppID') or 'n/a'