Update .gitignore to ignore dlls and pdbs
Update .gitignore to ignore dlls and pdbs

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