Add environment variable for table name

Allow dynamic table name access from within the code.

Author: tmilewski

aws-node-rest-api-with-dynamodb/serverless.yml

@@ -5,6 +5,8 @@ frameworkVersion: ">=1.1.0 <2.0.0"
 provider:
   name: aws
   runtime: nodejs4.3
+  environment:
+    DYNAMODB_TABLE: ${self:service}-${opt:stage, self:provider.stage}
   iamRoleStatements:
     - Effect: Allow
       Action: