brew-pull: Allow pull request numbers as arguments
brew-pull: Allow pull request numbers as arguments

If an integer is passed to `brew-pull`, such as `brew pull 6600`, it will be
interpreted as a pull request number. This has the same effect as the more
verbose command line:

    brew pull https://github.com/mxcl/homebrew/pull/6600

reelsense/brew,DomT4/brew,mahori/brew,pseudocody/brew,zmwangx/brew,claui/brew,claui/brew,vitorgalvao/brew,mahori/brew,reelsense/brew,mahori/brew,amar-laksh/brew_sudo,muellermartin/dist,Homebrew/brew,EricFromCanada/brew,staticfloat/brew,JCount/brew,konqui/brew,EricFromCanada/brew,Linuxbrew/brew,palxex/brew,muellermartin/dist,nandub/brew,rwhogg/brew,hanxue/linuxbrew,MikeMcQuaid/brew,reitermarkus/brew,nandub/brew,toonetown/homebrew,palxex/brew,zmwangx/brew,MikeMcQuaid/brew,ilovezfs/brew,mgrimes/brew,alyssais/brew,aw1621107/brew,rwhogg/brew,nandub/brew,alyssais/brew,tonyg/homebrew,nandub/brew,sjackman/homebrew,pseudocody/brew,gordonmcshane/homebrew,vitorgalvao/brew,toonetown/homebrew,jmsundar/brew,ilovezfs/brew,MikeMcQuaid/brew,aw1621107/brew,gregory-nisbet/brew,Linuxbrew/brew,DomT4/brew,EricFromCanada/brew,JCount/brew,ilovezfs/brew,palxex/brew,mistydemeo/homebrew,zmwangx/brew,konqui/brew,Linuxbrew/brew,tonyg/homebrew,sjackman/homebrew,Linuxbrew/brew,Homebrew/brew,amar-laksh/brew_sudo,alyssais/brew,jmsundar/brew,konqui/brew,mahori/brew,amar-laksh/brew_sudo,hanxue/linuxbrew,maxim-belkin/brew,reitermarkus/brew,AnastasiaSulyagina/brew,jmsundar/brew,maxim-belkin/brew,gordonmcshane/homebrew,rwhogg/brew,reitermarkus/brew,gordonmcshane/homebrew,Homebrew/brew,bfontaine/brew,vitorgalvao/brew,EricFromCanada/brew,gregory-nisbet/brew,sjackman/homebrew,bfontaine/brew,staticfloat/brew,tonyg/homebrew,bfontaine/brew,konqui/brew,pseudocody/brew,gregory-nisbet/brew,mgrimes/brew,staticfloat/brew,MikeMcQuaid/brew,toonetown/homebrew,hanxue/linuxbrew,claui/brew,DomT4/brew,AnastasiaSulyagina/brew,JCount/brew,AnastasiaSulyagina/brew,Homebrew/brew,JCount/brew,maxim-belkin/brew,reitermarkus/brew,mistydemeo/homebrew,mistydemeo/homebrew,aw1621107/brew,sjackman/homebrew,claui/brew,vitorgalvao/brew,muellermartin/dist,reelsense/brew,DomT4/brew,mgrimes/brew