Add TODO

TODO.markdown

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+TODO
+----
+
+* TLS encryption for remote syslog.
+* Automatically set up DNS / Elastic IP / ELB?
+* Code is a bit of a mess, could do with more cleanup.
+* The bootstrap script (installs Ruby, RubyGems etc) would probably be better
+  off separated out into its own script.
+* CloudWatch calls to create alarms (at setup time) and push metric data (every
+  2 minutes) use the CloudWatch command-line tools, which are written in Java
+  and spawn a new JVM for every API request, which is unnecessarily slow and
+  memory-hungry.  Replace these with calls directly from Ruby (maybe use the
+  [`right_aws`](http://rubygems.org/gems/right_aws) gem once its CloudWatch
+  wrapper supports the new mon-put-data and mon-put-metric-alarm calls).