added type checking for the Casper's clientScripts option
added type checking for the Casper's clientScripts option

jamesanthonyferguson/casperjs,n1k0/casperjs,mcwonka/casperjs,vietch2612/casperjs,HienLeThi/Casperjs_Demo,jamesanthonyferguson/casperjs,singhdev/casperjs,RobertoMalatesta/casperjs,n1k0/casperjs,pbrazdil/casperjs,muntasir2000/casperjs,dj31416/casperjs,casperjs/casperjs,flyHe/casperjs,n1k0/casperjs,artillery/casperjs,joshuafcole/casperjs,istr/casperjs,kyroskoh/casperjs,kyroskoh/casperjs,RobertoMalatesta/casperjs,muntasir2000/casperjs,hexid/casperjs,pcarrier-packaging/deb-casperjs,linkedin/casperjs,Andrey-Pavlov/casperjs,casperjs/casperjs,joshuafcole/casperjs,dj31416/casperjs,ravindrasingh22/casperjs,vietch2612/casperjs,jefleponot/casperjs,hudl/casperjs,pbrazdil/casperjs,pbrazdil/casperjs,kyroskoh/casperjs,jefleponot/casperjs,vietch2612/casperjs,pcarrier-packaging/deb-casperjs,cryptoquick/casperjs,singhdev/casperjs,mickaelandrieu/casperjs,sircelsiussexy/casperjs,kyroskoh/casperjs,cryptoquick/casperjs,hexid/casperjs,joshuafcole/casperjs,hexid/casperjs,vietch2612/casperjs,RobertoMalatesta/casperjs,casperjs/casperjs,hlr1983/casperjs,dj31416/casperjs,istr/casperjs,hudl/casperjs,ravindrasingh22/casperjs,vietch2612/casperjs,jefleponot/casperjs,dj31416/casperjs,mcwonka/casperjs,JZL/casperjs,ravindrasingh22/casperjs,soundyogi/casperjs,HienLeThi/Casperjs_Demo,jefleponot/casperjs,hexid/casperjs,casperjs/casperjs,linkedin/casperjs,Andrey-Pavlov/casperjs,n1k0/casperjs,jjyycchh/casperjs,ravindrasingh22/casperjs,Andrey-Pavlov/casperjs,jjyycchh/casperjs,artillery/casperjs,HienLeThi/Casperjs_Demo,istr/casperjs,vladikoff/casperjs,PeterWangPo/casperjs,flyHe/casperjs,JZL/casperjs,JZL/casperjs,davidwhthomas/casperjs,Andrey-Pavlov/casperjs,mickaelandrieu/casperjs,hudl/casperjs,cryptoquick/casperjs,istr/casperjs,casperjs/casperjs,kyroskoh/casperjs,mcwonka/casperjs,hlr1983/casperjs,kyroskoh/casperjs,mcwonka/casperjs,soundyogi/casperjs,ravindrasingh22/casperjs,vladikoff/casperjs,hlr1983/casperjs,mickaelandrieu/casperjs,sircelsiussexy/casperjs,JZL/casperjs,artillery/casperjs,artillery/casperjs,flyHe/casperjs,cryptoquick/casperjs,alexbiehl/casperjs,jamesanthonyferguson/casperjs,cryptoquick/casperjs,sircelsiussexy/casperjs,jjyycchh/casperjs,davidwhthomas/casperjs,istr/casperjs,hexid/casperjs,PeterWangPo/casperjs,alexbiehl/casperjs,RobertoMalatesta/casperjs,soundyogi/casperjs,alexbiehl/casperjs,HienLeThi/Casperjs_Demo,muntasir2000/casperjs,casperjs/casperjs,JZL/casperjs,flyHe/casperjs,jjyycchh/casperjs,dj31416/casperjs,soundyogi/casperjs,joshuafcole/casperjs,linkedin/casperjs,alexbiehl/casperjs,davidwhthomas/casperjs,RobertoMalatesta/casperjs,linkedin/casperjs,RobertoMalatesta/casperjs,HienLeThi/Casperjs_Demo,soundyogi/casperjs,mickaelandrieu/casperjs,muntasir2000/casperjs,hlr1983/casperjs,pcarrier-packaging/deb-casperjs,PeterWangPo/casperjs,singhdev/casperjs,sircelsiussexy/casperjs,artillery/casperjs,PeterWangPo/casperjs,Andrey-Pavlov/casperjs,alexbiehl/casperjs,pcarrier-packaging/deb-casperjs,jefleponot/casperjs,n1k0/casperjs,jjyycchh/casperjs,pbrazdil/casperjs,vladikoff/casperjs,hudl/casperjs,hexid/casperjs,Andrey-Pavlov/casperjs,cryptoquick/casperjs,flyHe/casperjs,jefleponot/casperjs,artillery/casperjs,JZL/casperjs,alexbiehl/casperjs,hudl/casperjs,pbrazdil/casperjs,mickaelandrieu/casperjs,n1k0/casperjs,linkedin/casperjs,sircelsiussexy/casperjs,linkedin/casperjs,singhdev/casperjs,vladikoff/casperjs,sircelsiussexy/casperjs,jamesanthonyferguson/casperjs,vietch2612/casperjs,jamesanthonyferguson/casperjs,singhdev/casperjs,davidwhthomas/casperjs,joshuafcole/casperjs,HienLeThi/Casperjs_Demo,joshuafcole/casperjs,ravindrasingh22/casperjs,muntasir2000/casperjs,jjyycchh/casperjs,soundyogi/casperjs,istr/casperjs,mickaelandrieu/casperjs,davidwhthomas/casperjs,flyHe/casperjs,jamesanthonyferguson/casperjs,mcwonka/casperjs,hlr1983/casperjs,pbrazdil/casperjs,mcwonka/casperjs,hlr1983/casperjs,dj31416/casperjs,vladikoff/casperjs,PeterWangPo/casperjs,PeterWangPo/casperjs,muntasir2000/casperjs,davidwhthomas/casperjs