fix(deprecate-utils): Add location where deprecation warning was issued

- Resolves #1599

src/deprecate-utils.coffee

@@ -1,6 +1,16 @@
 _ = require 'underscore'
 
 class DeprecateUtils
+  # See
+  # http://www.codeovertones.com/2011/08/how-to-print-stack-trace-anywhere-in.html
+  @parseStack: (stackString) ->
+    stack = stackString
+      .replace(/^[^\(]+?[\n$]/gm, '')
+      .replace(/^\s+at\s+/gm, '')
+      .replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@')
+      .split('\n')
+    return stack
+
   @warn: (condition, message) ->
     console.warn message if condition
 
@@ -8,10 +18,11 @@ class DeprecateUtils
     if NylasEnv.inDevMode() and not NylasEnv.inSpecMode()
       warn = true
       newFn = =>
+        stack = DeprecateUtils.parseStack((new Error()).stack)
         DeprecateUtils.warn(
           warn,
           "Deprecation warning! #{fnName} is deprecated and will be removed soon.
-          Use #{newName} instead."
+          Use #{newName} instead.\nCheck your code at #{stack[1]}"
         )
         warn = false
         return fn.apply(ctx, arguments)