Ignore '-' when looking for duplicate characters in tick labels. Fixes astrofrog/wcsaxes#17.
Ignore '-' when looking for duplicate characters in tick labels. Fixes astrofrog/wcsaxes#17.

dhomeier/astropy,AustereCuriosity/astropy,lpsinger/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,pllim/astropy,pllim/astropy,tbabej/astropy,StuartLittlefair/astropy,larrybradley/astropy,StuartLittlefair/astropy,joergdietrich/astropy,tbabej/astropy,funbaker/astropy,astropy/astropy,astropy/astropy,tbabej/astropy,dhomeier/astropy,stargaser/astropy,AustereCuriosity/astropy,dhomeier/astropy,StuartLittlefair/astropy,larrybradley/astropy,bsipocz/astropy,tbabej/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,tbabej/astropy,bsipocz/astropy,lpsinger/astropy,kelle/astropy,AustereCuriosity/astropy,MSeifert04/astropy,joergdietrich/astropy,mhvk/astropy,funbaker/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,joergdietrich/astropy,bsipocz/astropy,stargaser/astropy,kelle/astropy,pllim/astropy,MSeifert04/astropy,lpsinger/astropy,funbaker/astropy,kelle/astropy,lpsinger/astropy,mhvk/astropy,kelle/astropy,StuartLittlefair/astropy,joergdietrich/astropy,stargaser/astropy,bsipocz/astropy,joergdietrich/astropy,pllim/astropy,DougBurke/astropy,saimn/astropy,lpsinger/astropy,DougBurke/astropy,astropy/astropy,astropy/astropy,astropy/astropy,dhomeier/astropy,MSeifert04/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,mhvk/astropy,pllim/astropy,stargaser/astropy,funbaker/astropy,mhvk/astropy,kelle/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,saimn/astropy,larrybradley/astropy,larrybradley/astropy,saimn/astropy,saimn/astropy,saimn/astropy,mhvk/astropy