Update installation.rst
Update installation.rst

Added windows-specific workaround for systems with both integrated and discrete graphics
linkedin/casperjs,JZL/casperjs,cryptoquick/casperjs,jjyycchh/casperjs,jefleponot/casperjs,soundyogi/casperjs,flyHe/casperjs,hlr1983/casperjs,mickaelandrieu/casperjs,dj31416/casperjs,istr/casperjs,flyHe/casperjs,JZL/casperjs,hexid/casperjs,muntasir2000/casperjs,pbrazdil/casperjs,RobertoMalatesta/casperjs,muntasir2000/casperjs,casperjs/casperjs,cryptoquick/casperjs,mickaelandrieu/casperjs,soundyogi/casperjs,linkedin/casperjs,hexid/casperjs,ravindrasingh22/casperjs,HienLeThi/Casperjs_Demo,davidwhthomas/casperjs,HienLeThi/Casperjs_Demo,davidwhthomas/casperjs,singhdev/casperjs,soundyogi/casperjs,mcwonka/casperjs,joshuafcole/casperjs,ravindrasingh22/casperjs,alexbiehl/casperjs,pbrazdil/casperjs,alexbiehl/casperjs,istr/casperjs,jefleponot/casperjs,casperjs/casperjs,JZL/casperjs,RobertoMalatesta/casperjs,casperjs/casperjs,jefleponot/casperjs,artillery/casperjs,singhdev/casperjs,artillery/casperjs,hexid/casperjs,vietch2612/casperjs,jamesanthonyferguson/casperjs,jjyycchh/casperjs,RobertoMalatesta/casperjs,linkedin/casperjs,mcwonka/casperjs,joshuafcole/casperjs,jamesanthonyferguson/casperjs,Andrey-Pavlov/casperjs,n1k0/casperjs,soundyogi/casperjs,pbrazdil/casperjs,hlr1983/casperjs,hlr1983/casperjs,flyHe/casperjs,dj31416/casperjs,jefleponot/casperjs,hexid/casperjs,flyHe/casperjs,kyroskoh/casperjs,artillery/casperjs,artillery/casperjs,davidwhthomas/casperjs,Andrey-Pavlov/casperjs,JZL/casperjs,cryptoquick/casperjs,cryptoquick/casperjs,sircelsiussexy/casperjs,mickaelandrieu/casperjs,vietch2612/casperjs,jamesanthonyferguson/casperjs,sircelsiussexy/casperjs,kyroskoh/casperjs,vietch2612/casperjs,hlr1983/casperjs,istr/casperjs,istr/casperjs,singhdev/casperjs,jjyycchh/casperjs,sircelsiussexy/casperjs,vietch2612/casperjs,vietch2612/casperjs,dj31416/casperjs,Andrey-Pavlov/casperjs,kyroskoh/casperjs,ravindrasingh22/casperjs,PeterWangPo/casperjs,kyroskoh/casperjs,Andrey-Pavlov/casperjs,dj31416/casperjs,n1k0/casperjs,HienLeThi/Casperjs_Demo,sircelsiussexy/casperjs,PeterWangPo/casperjs,joshuafcole/casperjs,vietch2612/casperjs,JZL/casperjs,mickaelandrieu/casperjs,RobertoMalatesta/casperjs,n1k0/casperjs,Andrey-Pavlov/casperjs,jefleponot/casperjs,hexid/casperjs,JZL/casperjs,artillery/casperjs,jamesanthonyferguson/casperjs,alexbiehl/casperjs,mickaelandrieu/casperjs,ravindrasingh22/casperjs,hlr1983/casperjs,jjyycchh/casperjs,singhdev/casperjs,mickaelandrieu/casperjs,n1k0/casperjs,pbrazdil/casperjs,alexbiehl/casperjs,singhdev/casperjs,joshuafcole/casperjs,davidwhthomas/casperjs,casperjs/casperjs,istr/casperjs,soundyogi/casperjs,kyroskoh/casperjs,RobertoMalatesta/casperjs,muntasir2000/casperjs,istr/casperjs,ravindrasingh22/casperjs,HienLeThi/Casperjs_Demo,mcwonka/casperjs,mcwonka/casperjs,linkedin/casperjs,ravindrasingh22/casperjs,davidwhthomas/casperjs,cryptoquick/casperjs,PeterWangPo/casperjs,kyroskoh/casperjs,jjyycchh/casperjs,HienLeThi/Casperjs_Demo,muntasir2000/casperjs,pbrazdil/casperjs,mcwonka/casperjs,sircelsiussexy/casperjs,PeterWangPo/casperjs,alexbiehl/casperjs,jjyycchh/casperjs,davidwhthomas/casperjs,HienLeThi/Casperjs_Demo,dj31416/casperjs,Andrey-Pavlov/casperjs,jamesanthonyferguson/casperjs,PeterWangPo/casperjs,artillery/casperjs,hlr1983/casperjs,PeterWangPo/casperjs,mcwonka/casperjs,casperjs/casperjs,soundyogi/casperjs,muntasir2000/casperjs,linkedin/casperjs,cryptoquick/casperjs,dj31416/casperjs,hexid/casperjs,alexbiehl/casperjs,flyHe/casperjs,n1k0/casperjs,n1k0/casperjs,jefleponot/casperjs,jamesanthonyferguson/casperjs,flyHe/casperjs,joshuafcole/casperjs,casperjs/casperjs,linkedin/casperjs,muntasir2000/casperjs,pbrazdil/casperjs,sircelsiussexy/casperjs,RobertoMalatesta/casperjs,joshuafcole/casperjs