Added possibility to disable escaping

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | todo

I need to use an environment variable in my process arguments, but there is no way to be able to do that now, since everything is escaped with single quotes. This adds a feature to disable this.

Refs bldr-io/bldr#99