Demonstrate #11
Fix #11 ("Replace quotes with escaping" excessively escapes single quote on double quoted string)
Fix bad test data on testEscapeSequences
Demonstrate #11 also for heredocs
Fix #11 for heredocs ("Replace quotes with escaping" excessively escapes single quote on double quoted string)
Fix bad test data on testEscapeSequences
Fix unneeded backslash escape at end of nowdoc when converting to heredoc
Fix bad regexp to look for backslashes which need to be escaped on creating double quoted string and heredocs
Add test for verifying the fix