Printer no longer escapes ' in string values

The string "'" used to print as "\'", now it prints as "'".
set version in pom.xml to 0.4.1 for release
update version to 0.4.1 in README.md
Merge branch 'release/0.4.1' into develop

* release/0.4.1:
  update version to 0.4.1 in README.md
  set version in pom.xml to 0.4.1 for release
prepare pom.xml for development by setting version to develop-SNAPSHOT