Sqlcmd

- Now calls grizzled.cmdline.CommandLineParser's die_with_usage() method,
instead of the deprecated show_usage() method.
- Now supports shell-style variables. See the User's Guide for details.

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- Now properly bundles ez_setup.py
- Now supports Gadfly (http://gadfly.sourceforge.net/)

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- Fixed bug with --database option introduced in version 0.3
- When loading a file (via ".load" at the prompt or file on the command line),
sqlcmd no longer adds the contents to the history.

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- Ctrl-C (SIGINT) at the command prompt now simply returns to the command
prompt without doing anything, instead of exiting sqlcmd. Thanks to James
William Pye (x /at/ jwp.name) for the suggestion.
- Added .echo command
- Added ability to specify an on-connect script for each database listed
in the configuration file. sqlcmd runs the on-connect script, immediately
after connecting to the database.
- Moved WrappingLogFormatter to Grizzled API (grizzled.log module).
- Moved str2bool() function to Grizzled API (grizzled.misc module).

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- Fixed bug that caused sqlcmd to crash when displaying binary data.

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- Unicode-related changes to permit sqlcmd to handle databases with
non-ASCII characters. Thanks to Stephane Matamontero for noting the problem
and submitting a patch.
- Fixed a problem with history management and multiline commands.
- Documented "sqlcmd.history" module.
- Added --version (-v) command line option.

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