allow alternative spellings for encoding names in c_string_encoding directive, fix c_string_type=unicode
allow alternative spellings for encoding names in c_string_encoding directive, fix c_string_type=unicode

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