remove directory permission checking, since cli can handle this for us
call ->database() instead ->mysql()
update usage() add db_driver option
add default value for db_driver to mysqli
correct variable name and cli argument name to match with model/install.php
fix indent style
correct path to "download" directory
correct path to "download" directory
add DIR_MODIFICATION
set default db_prefix to "oc_"
Merge pull request #1209 from ball6847/fix_cli_installer

Fix cli_installer.php