Interactive mode for dev projects #35
Description
Add option --interactive for dev ps so that one can go through clone projects. After calling dev ps --interactive, dev changes the current working directory to the first cloned repository path. Then, by calling dev ps --next and dev ps --prev, it goes to the next and previous ones respectively. dev ps --abort will clear the iteration list. By having #33 and #34 implemented, this iteration can be restricted to a subset of repositories and in each repository the provided command is executed automatically or manually (e.g. by calling dev ps -x/--execute).