Update flow types

Author: tmitchel2

.eslintrc

@@ -58,7 +58,7 @@
     "dot-location": [2, "property"],
     "dot-notation": 0,
     "eol-last": 2,
-    "eqeqeq": 2,
+    "eqeqeq": [2, "allow-null"],
     "func-names": 0,
     "func-style": 0,
     "generator-star-spacing": [0, {"before": true, "after": false}],

.flowconfig

@@ -7,6 +7,10 @@
 [include]
 
 [libs]
+./flow
 
 [options]
+esproposal.class_static_fields=enable
+esproposal.class_instance_fields=enable
+munge_underscores=true
 suppress_comment= \\(.\\|\n\\)*\\$FlowIgnore