Merge branch 'static-cols' into master

Disable colorized output if the output stream is not a TTY, but allow…

… forcing colorized output

Autoload cli.php in Composer (fixes wp-cli#24)

Provide a way to reset Notifiers for reuse. Fixes wp-cli#19

Tagged temporary version with fix

Refactor Tabular display to use renderers (currently tabular and ascii).

Composer support