Additional SQS unit tests.
Fix typo bug in completer.  Fixes #30.
Added zsh completion using bashcompinit

    - Added snippet to make auto completion work in zsh using
      the bash compatibility mode
    - overwrote _bash_complete() to work around a bug that got
      fixed in
        http://zsh.cvs.sourceforge.net/viewvc/zsh/zsh/Completion/bashcompinit?r1=1.5&r2=1.6
      or
        https://github.com/zsh-users/zsh/commit/edab1d3dbe61da7efe5f1ac0e40444b2ec9b9570
    - Tested in zsh 5.0.2, zsh 4.3.11 (i386-apple-darwin12.0) and zsh
      4.3.17 (x86_64-unknown-linux-gnu)
    - Added short description to README
    - Note: a proper compinit zsh function will follow later.
Merge branch 'zshcomplete' of github.com:a8/aws-cli into zshcomplete