Fixed parsing raw string literals

[springcomp]

Fixes #42.

search( contains(['wanna be starting something'], a) , {"a": "wanna be starting something"} ) → true search( contains(['wanna be starting somethin\''], a) , {"a": "wanna be starting somethin'"} ) → true search( contains(['wanna be startin\' somethin\''], a) , {"a": "wanna be startin' somethin'"} ) → true