Add 'docs' command.
Allow 'platform get' with no arguments.
Refactor choice questions.
Merge pull request #195 from pjcdawkins/get-choose-project

Allow 'platform get' with no arguments
Add 'web' command to open the web UI, or website if not logged in.
Merge pull request #182 from pjcdawkins/feature/docs-command

Add 'docs' command
Add the new login / projects link.
openUrl tweaks
Merge pull request #192 from pjcdawkins/feature/ui-command

Add 'web' command
Update platform.rc with an autocompletion fix for some shell types.
Prevent deleting parent environments.

This is a workaround until Platform itself prevents this.

This also tweaks the error messages for other environment commands.
Add --merged option to deactivate all merged environments.