refs #1165 - fixed python bin for paths w/ spaces
refs #1165 - fixed python bin for paths w/ spaces

When python bin file is in a path containing spaces (typically with npm, e.g. ~/My Project/node_modules/casperjs/bin/casperjs), the CASPER_COMMAND becomes ['~/My', 'Project/node_modules/casperjs/bin/casperjs'] because of ENGINE_EXECUTABLE.split(' ') in line 127. It's now better and works with [ENGINE_EXECUTABLE].
HienLeThi/Casperjs_Demo,RobertoMalatesta/casperjs,JZL/casperjs,Andrey-Pavlov/casperjs,kyroskoh/casperjs,soundyogi/casperjs,ravindrasingh22/casperjs,cryptoquick/casperjs,mickaelandrieu/casperjs,jefleponot/casperjs,vietch2612/casperjs,vietch2612/casperjs,mcwonka/casperjs,PeterWangPo/casperjs,muntasir2000/casperjs,Andrey-Pavlov/casperjs,casperjs/casperjs,soundyogi/casperjs,JZL/casperjs,hlr1983/casperjs,joshuafcole/casperjs,soundyogi/casperjs,alexbiehl/casperjs,HienLeThi/Casperjs_Demo,Andrey-Pavlov/casperjs,PeterWangPo/casperjs,vietch2612/casperjs,joshuafcole/casperjs,artillery/casperjs,flyHe/casperjs,flyHe/casperjs,alexbiehl/casperjs,dj31416/casperjs,muntasir2000/casperjs,joshuafcole/casperjs,mcwonka/casperjs,mcwonka/casperjs,flyHe/casperjs,joshuafcole/casperjs,Andrey-Pavlov/casperjs,kyroskoh/casperjs,pbrazdil/casperjs,dj31416/casperjs,pbrazdil/casperjs,jamesanthonyferguson/casperjs,JZL/casperjs,cryptoquick/casperjs,artillery/casperjs,hexid/casperjs,hlr1983/casperjs,istr/casperjs,cryptoquick/casperjs,soundyogi/casperjs,jefleponot/casperjs,sircelsiussexy/casperjs,jjyycchh/casperjs,hexid/casperjs,pbrazdil/casperjs,kyroskoh/casperjs,jamesanthonyferguson/casperjs,HienLeThi/Casperjs_Demo,mickaelandrieu/casperjs,casperjs/casperjs,linkedin/casperjs,soundyogi/casperjs,PeterWangPo/casperjs,vietch2612/casperjs,soundyogi/casperjs,RobertoMalatesta/casperjs,JZL/casperjs,casperjs/casperjs,dj31416/casperjs,ravindrasingh22/casperjs,davidwhthomas/casperjs,istr/casperjs,linkedin/casperjs,mickaelandrieu/casperjs,casperjs/casperjs,n1k0/casperjs,jjyycchh/casperjs,muntasir2000/casperjs,alexbiehl/casperjs,mickaelandrieu/casperjs,HienLeThi/Casperjs_Demo,alexbiehl/casperjs,jjyycchh/casperjs,ravindrasingh22/casperjs,sircelsiussexy/casperjs,dj31416/casperjs,pbrazdil/casperjs,flyHe/casperjs,cryptoquick/casperjs,mickaelandrieu/casperjs,alexbiehl/casperjs,n1k0/casperjs,PeterWangPo/casperjs,vietch2612/casperjs,istr/casperjs,mcwonka/casperjs,artillery/casperjs,davidwhthomas/casperjs,artillery/casperjs,linkedin/casperjs,casperjs/casperjs,vietch2612/casperjs,ravindrasingh22/casperjs,jamesanthonyferguson/casperjs,linkedin/casperjs,linkedin/casperjs,RobertoMalatesta/casperjs,ravindrasingh22/casperjs,n1k0/casperjs,hlr1983/casperjs,joshuafcole/casperjs,kyroskoh/casperjs,mickaelandrieu/casperjs,PeterWangPo/casperjs,dj31416/casperjs,hexid/casperjs,muntasir2000/casperjs,HienLeThi/Casperjs_Demo,ravindrasingh22/casperjs,RobertoMalatesta/casperjs,sircelsiussexy/casperjs,flyHe/casperjs,jamesanthonyferguson/casperjs,artillery/casperjs,istr/casperjs,hexid/casperjs,muntasir2000/casperjs,dj31416/casperjs,cryptoquick/casperjs,JZL/casperjs,n1k0/casperjs,jamesanthonyferguson/casperjs,davidwhthomas/casperjs,PeterWangPo/casperjs,hlr1983/casperjs,mcwonka/casperjs,jamesanthonyferguson/casperjs,jjyycchh/casperjs,RobertoMalatesta/casperjs,hexid/casperjs,pbrazdil/casperjs,davidwhthomas/casperjs,hlr1983/casperjs,pbrazdil/casperjs,muntasir2000/casperjs,joshuafcole/casperjs,sircelsiussexy/casperjs,hlr1983/casperjs,n1k0/casperjs,HienLeThi/Casperjs_Demo,davidwhthomas/casperjs,mcwonka/casperjs,artillery/casperjs,kyroskoh/casperjs,n1k0/casperjs,Andrey-Pavlov/casperjs,jjyycchh/casperjs,jefleponot/casperjs,sircelsiussexy/casperjs,istr/casperjs,flyHe/casperjs,linkedin/casperjs,RobertoMalatesta/casperjs,istr/casperjs,jefleponot/casperjs,Andrey-Pavlov/casperjs,cryptoquick/casperjs,jefleponot/casperjs,kyroskoh/casperjs,jefleponot/casperjs,casperjs/casperjs,davidwhthomas/casperjs,sircelsiussexy/casperjs,hexid/casperjs,JZL/casperjs,jjyycchh/casperjs,alexbiehl/casperjs