Fix image path.
Merge branch 'release/1.0'

* release/1.0:
  Fix image path.
  Fix locating image
  Fix DIR_MELVABLE
  Improve README.md Add verbose message when replacing pre-existing melvable.
  Fix '-h not found'. Fix image listing. Delete sudo privileage Add --quiet git clone && wget
  Improve user prompt when melvable already exists. Add displaying warning and exit.
  Remove image extensino, 'sh' Improve README.md
  Improve adding symbolic link part.
  Initialize melvable
  Add README.md on module folder
  Initialize install.sh Improve README.md
  Add ubuntu_1404_tall
  Initialize ubuntu_1404_64bit_mac