Resolve quotes not being an escaped character

Created by: huntergoldstein

Changes introduced by this pull request:

• Quotes are now considered escaped characters as per IonFileCompleter
• pipelines::Collector now respects escaped characters in arguments, such as quotes
• pipelines::Collector also will now error if not at the top level of a job, i.e. not inside an array or subshell

Fixes: Closes #350 (closed)