add array_column() polyfill for PHP<5.5
show warning for invalid synopsis parts
Merge pull request #637 from mpeshev/master

wp user functions proposal: add-cap, remove-cap and list-caps
bump version to 0.12-alpha
remove success message from 'wp user list-caps'; fix coding standards; see #637
Merge pull request #636 from wp-cli/synopsis-warnings

Show warnings for invalid tokens in synopsis
add more info about Behat
mention where the test files are
Add Requests library and migrate Core commands to it
Composer.json merge