Add unstable Dockerfile for Ubuntu 14.04
Add unstable Dockerfile for Ubuntu 14.04

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