* Implemented option to build base docker images from within subuser:

 Suggetion: add subfolder makeBaseImages #24 

  see subuser/examples/SubuserBaseImages:
    - firefox_libx11_libubuntu_precise
    - libx11_libubuntu_precise
    - libubuntu_precise
    - libdebian_jessie
    - libdebian_wheezy
    - libubuntu_trust