refactored usage
fixed a typo
renamed usage function
improved usage functions docblock
Reword.
Merge branch 'refactore-usage' of git://github.com/larsvegas/amp into larsvegas-refactore-usage
Move usage function below FUNCTIONS section.
Define functions first.
List known services in help; prepare service select.

Split some sections.
Do not start apache and mysql by default.
Adding memcached service.
Update mongodb service to user version neutral brew config.
Remove commented code.
Improve waiting on mysqld.
Log mysqld output.
'∞' loop over to be started services.
Enable selecting services to be start/stop/..
Better message when mysql has been entirely started up.
Preparing version support for services.