Add draft of 'code-review-start'

This command will store the desired merge base for the current branch,
defaulting to "origin/master". In so doing, subsequent `code-review`
subcommands will have access to this and be able to default to a merge
base branch instead of:

* Having users specify one manually at the command line for each
  `code-review` subcommand
* Having a default merge base branch that's not desired by users

I figure I can hopefully get away with not sanitizing SQL input because
I don't think you can use apostrophes in Git branch names. Otherwise
I'll probably have to port this to another language with a SQLite
library, as it doesn't seem possible to easily sanitize inputs in Bash.

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