Feature wishes

[gralpli]

• switch to double quotes instead of single quotes to solve #6 (?)
• use $'\n' to escape newline and other control characters (this works for bash, so maybe escape() should take an argument like Shell::Bash)
• add surrounding quotes only if the argument contains spaces
  • to create a nicer output that is also displayable to the user
  • if there is a choice the user should maybe also be able to choose which quotes he prefers, like: escape(…, Shell::Bash(Quotes::Single))

I just wanted to leave those ideas here as a note. Maybe I implement them sometime in the future (maybe not).