Upgrade to Meteor 2.12-beta.2 .

Thanks to Meteor developers!

.meteor/packages

@@ -6,7 +6,7 @@
 meteor-base@1.5.1
 
 # Build system
-ecmascript@0.16.6
+ecmascript@0.16.7-beta2120.2
 standard-minifier-js@2.8.1
 mquandalle:jade
 coffeescript@2.4.1!
@@ -21,7 +21,7 @@ cottz:publish-relations
 dburles:collection-helpers
 idmontie:migrations
 easy:search
-mongo@1.16.5
+mongo@1.16.6-beta2120.2
 mquandalle:collection-mutations
 
 # Account system
@@ -43,8 +43,8 @@ jquery@3.0.0!
 random@1.2.1
 reactive-dict@1.3.1
 session@1.2.1
-tracker@1.3.1
-underscore@1.0.12
+tracker@1.3.2-beta2120.2
+underscore@1.0.13-beta2120.2
 arillo:flow-router-helpers
 audit-argument-checks@1.0.7
 kadira:blaze-layout
@@ -67,9 +67,9 @@ templates:tabs
 meteor-autosize
 rajit:bootstrap3-datepicker
 shell-server@0.5.0
-email@2.2.4
+email@2.2.5-beta2120.2
 horka:swipebox
-dynamic-import@0.7.2
+dynamic-import@0.7.3-beta2120.2
 cfs:gridfs
 rzymek:fullcalendar
 msavin:usercache
@@ -141,4 +141,4 @@ kadira:flow-router
 spacebars
 service-configuration@1.3.1
 communitypackages:picker
-minifier-css@1.6.2
+minifier-css@1.6.4-beta2120.2