Whitelist master and test branches for Travis CI
Whitelist master and test branches for Travis CI

Only pull requests, merges to master, and branches starting with the
prefix "test" will trigger Travis CI builds.

bingbing8/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,jsoref/PowerShell,jsoref/PowerShell,KarolKaczmarek/PowerShell,KarolKaczmarek/PowerShell,JamesWTruher/PowerShell-1,daxian-dbw/PowerShell,PaulHigin/PowerShell,PaulHigin/PowerShell,bmanikm/PowerShell,daxian-dbw/PowerShell,kmosher/PowerShell,bingbing8/PowerShell,JamesWTruher/PowerShell-1,bingbing8/PowerShell,bmanikm/PowerShell,TravisEz13/PowerShell,kmosher/PowerShell,kmosher/PowerShell,kmosher/PowerShell,KarolKaczmarek/PowerShell,KarolKaczmarek/PowerShell,jsoref/PowerShell,KarolKaczmarek/PowerShell,bingbing8/PowerShell,bmanikm/PowerShell,jsoref/PowerShell,bingbing8/PowerShell,JamesWTruher/PowerShell-1,PaulHigin/PowerShell,JamesWTruher/PowerShell-1,kmosher/PowerShell,bmanikm/PowerShell,daxian-dbw/PowerShell,TravisEz13/PowerShell,PaulHigin/PowerShell,TravisEz13/PowerShell,bmanikm/PowerShell,jsoref/PowerShell