pgcli/TODO

* [ ] Add more complex slash commands such as \d <table_name>.
* [ ] Update README.
* [ ] Upload rev 2 to PyPI.
* [ ] Add a new trigger for M-/ that does dumb completion.
* [ ] Find a way to add documentation to sql commands. This could get tricky.
* [ ] Add a lot more SQL keywords to auto-completion (Read the postgres docs)
* [ ] Add tests for smart completion.
* [ ] Detect a '.' and parse the word before it and get it's real name.
* [] Refactor the execution and output into a separate class.
* [] Create a class for the config and make it easy to access.
* [o] Get new table style merged back to tabulate.
* [] Send the last token as a PR back to sqlparse.
* [] Create a better framework for adding special commands.
    * A dict with special commands as keys.
    * The value can either be a string or a callable.
* [X] Deal with commands that have no return rows (such as delete, begin transaction etc).
* [X] Add borders around the table.
* [X] Investigate why having a space in the beginning of the line breaks everything.
* [X] Test if the special comands are autocompleted correctly.
* [x] Control smart completion via config file.
* [x] Figure out how to deal with transactions.
* [X] Add a config file.
* [X] Add context sensitive auto-completion.
    * Check how sqlpython is doing it.
* [X] Prettify the output into nice columnar tables.
* [X] Check how to deal with failed commands that result in dangling transaction.
* [X] Add a history file.
* [X] Deal with errors that happen at connection (password, host etc).
* [X] Deal with errors that happen during sql execution.
* [X] Add auto-completion based on the tables, columns names.
    * launch psql with -E option and try \d, \dt etc and copy the sql statements.
* [X] Translate the commands to pg backend.
* [X] Add options to read the host, user, passwd etc.
* [X] Add the back-slash commands.
    * launch psql with -E option and try \d, \dt etc and copy the sql statements.