Create a Message Model

I created a message model for recording messages sent and handling
their validation before sent.
Added a Validation for Message Length

I added a validation that message length is at most 160 characters.
Installed SimpleForm

I installed SimpleForm for use in messages.
Create a Message Controller

I create a message controller for list and creating messages.
Added an Message Sending to Messages

I added a after_create hook to messages to send a Twilio message.
Fixed a Bug in Recording Subscriptions

I was recording the To number instead of the From number.
Made Messages a Nested Resource of Keyword

I made messages a nested resource of keyword, so the message can be
sent to the correct numbers when the message is created.
Merge branch 'create-messages' into development