Fix Golang output to appease Golint (#34)

- Change package name must be lowercase, not mixed case.
- Change CanDeviceId and CanMsgId to CanDeviceID and CanMsgID.
- Add comments for CanDeviceId and CanMsgID.
- Add note about automating the process of copying the file to telemetry server.

templates/can_msg_defs.mako.go

@@ -1,18 +1,27 @@
 <%namespace name="helpers" file="/helpers/helpers.mako" /> \
 <% from data import NUM_CAN_MESSAGES, NUM_CAN_DEVICES, parse_can_device_enum, parse_can_message_enum, parse_can_frames %> \
-package CanMsgDefs
+package canmsgdefs
 
+// NOTE: This file is generated by codegen-tooling.
+// Currently, this file is copy-pasted from codegen output
+// to canmsgdefs in the telemetry server.
+
+// TODO: Automate this process.
+
+// CanDeviceID is a 16-bit integer for the source of a CAN message
 type CanDeviceId uint16
+
+// CanMsgID is a 32-bit integer for the type of CAN message
 type CanMsgId uint32
 
 // For setting the CAN device
 const (
  <% can_devices = parse_can_device_enum() %> \
-${helpers.generate_enum_go(can_devices, 'SystemCanDevice', 'CanDeviceId')}
+${helpers.generate_enum_go(can_devices, 'SystemCanDevice', 'CanDeviceID')}
 ) 
 
 // For setting the CAN message ID
 const (
  <% can_messages = parse_can_message_enum(options.filename) %> \
-${helpers.generate_enum_go(can_messages, 'SystemCanMessage', 'CanMsgId')}
+${helpers.generate_enum_go(can_messages, 'SystemCanMessage', 'CanMsgID')}
 )