use `wp core version` instead of `wp post list` to check if the install
was successful.
made dbpass parameter optional for core config command
regenerated the man page for core config command
Merge pull request #334 from sebastiaandegeus/master

dbpass as an optional argument for wp core config command
delete submodules
add composer.lock
travis: no more submodules to initialize
install and use Composer in utils/dev-build
remove loading from submodules
update make-phar.php to use vendor dir
Merge pull request #336 from wp-cli/no-submodules

Replace git submodules with Composer dependencies