naming_conventions: Support kebab-case
naming_conventions: Support kebab-case

Adds function to_kebabcase() to convert string to kebab-case.

Relates to https://github.com/coala/coala-bears/issues/1013

yashLadha/coala,arjunsinghy96/coala,sagark123/coala,RJ722/coala,jayvdb/coala,Asalle/coala,RJ722/coala,Asalle/coala,aptrishu/coala,CruiseDevice/coala,Asnelchristian/coala,ayushin78/coala,damngamerz/coala,MariosPanag/coala,rimacone/testing2,rimacone/testing2,kartikeys98/coala,Balaji2198/coala,nemaniarjun/coala,sagark123/coala,shreyans800755/coala,coala/coala,arjunsinghy96/coala,karansingh1559/coala,Asnelchristian/coala,refeed/coala,CruiseDevice/coala,kartikeys98/coala,RJ722/coala,incorrectusername/coala,yashLadha/coala,Asalle/coala,kartikeys98/coala,damngamerz/coala,Nosferatul/coala,Shade5/coala,SanketDG/coala,netman92/coala,shreyans800755/coala,JohnS-01/coala,ayushin78/coala,JohnS-01/coala,rimacone/testing2,nemaniarjun/coala,coala/coala,MariosPanag/coala,SanketDG/coala,yashLadha/coala,Balaji2198/coala,karansingh1559/coala,incorrectusername/coala,ayushin78/coala,coala-analyzer/coala,arjunsinghy96/coala,Nosferatul/coala,Balaji2198/coala,aptrishu/coala,netman92/coala,aptrishu/coala,Shade5/coala,coala-analyzer/coala,netman92/coala,Nosferatul/coala,karansingh1559/coala,damngamerz/coala,Shade5/coala,refeed/coala,arush0311/coala,shreyans800755/coala,incorrectusername/coala,Asnelchristian/coala,SanketDG/coala,arush0311/coala,MariosPanag/coala,coala-analyzer/coala,JohnS-01/coala,coala/coala,CruiseDevice/coala,arush0311/coala,jayvdb/coala,sagark123/coala,refeed/coala,nemaniarjun/coala,jayvdb/coala