Fix trac #640, long string literals with escapes.
Fix trac #640, long string literals with escapes.

hickford/cython,hickford/cython,hhsprings/cython,larsmans/cython,JelleZijlstra/cython,ChristopherHogan/cython,slonik-az/cython,andreasvc/cython,andreasvc/cython,JelleZijlstra/cython,mcanthony/cython,ABcDexter/cython,cython/cython,c-blake/cython,mrGeen/cython,hhsprings/cython,scoder/cython,hpfem/cython,andreasvc/cython,ChristopherHogan/cython,mrGeen/cython,encukou/cython,cython/cython,c-blake/cython,larsmans/cython,cython/cython,mrGeen/cython,hhsprings/cython,mcanthony/cython,mcanthony/cython,dahebolangkuan/cython,bzzzz/cython,encukou/cython,marscher/cython,achernet/cython,achernet/cython,fabianrost84/cython,fabianrost84/cython,marscher/cython,scoder/cython,madjar/cython,da-woods/cython,andreasvc/cython,hhsprings/cython,encukou/cython,slonik-az/cython,madjar/cython,fabianrost84/cython,mcanthony/cython,hickford/cython,fperez/cython,scoder/cython,mcanthony/cython,dahebolangkuan/cython,hpfem/cython,madjar/cython,acrispin/cython,fabianrost84/cython,hickford/cython,JelleZijlstra/cython,encukou/cython,c-blake/cython,fperez/cython,marscher/cython,roxyboy/cython,mrGeen/cython,ABcDexter/cython,fperez/cython,roxyboy/cython,achernet/cython,rguillebert/CythonCTypesBackend,bzzzz/cython,scoder/cython,JelleZijlstra/cython,acrispin/cython,c-blake/cython,rguillebert/CythonCTypesBackend,fperez/cython,JelleZijlstra/cython,da-woods/cython,larsmans/cython,hickford/cython,roxyboy/cython,dahebolangkuan/cython,fabianrost84/cython,dahebolangkuan/cython,mrGeen/cython,achernet/cython,c-blake/cython,roxyboy/cython,andreasvc/cython,marscher/cython,rguillebert/CythonCTypesBackend,rguillebert/CythonCTypesBackend,slonik-az/cython,hpfem/cython,acrispin/cython,acrispin/cython,marscher/cython,ChristopherHogan/cython,acrispin/cython,hpfem/cython,ABcDexter/cython,achernet/cython,larsmans/cython,da-woods/cython,madjar/cython,fperez/cython,hhsprings/cython,roxyboy/cython,bzzzz/cython,hpfem/cython,cython/cython,madjar/cython,encukou/cython,slonik-az/cython,ABcDexter/cython,slonik-az/cython,larsmans/cython,dahebolangkuan/cython,bzzzz/cython,ABcDexter/cython,da-woods/cython