MQE-1153: ExecuteJS javascript escaping matches persisted data

[aljcalandra]

ExecuteJS should now properly escape sequences without involving persisted data

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/verification tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)
• Changes to Framework doesn't have backward incompatible changes for tests or have related Pull Request with fixes to tests

[coveralls]

Coverage remained the same at 56.165% when pulling a6bc047 on MQE-1153 into df6aaf9 on develop.