added selftest command to usage.txt
added selftest command to usage.txt

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