Bump version to 0.16
PEP8 fixes on ci directory
PEP8 fixes on contrib/snf-pithos-tools directory
PEP8 fixes on contrib directory
PEP8 fixes on conf directory
PEP8 fixes on snf-admin-app directory
PEP8 fixes on snf-astakos-app/astakos/im/migrations directory
PEP8 fixes on snf-astakos-app/astakos/admin directory
PEP8 fixes on snf-astakos-app/astakos/api directory
PEP8 fixes on snf-astakos-app/astakos/im directory
PEP8 fixes on snf-astakos-app/astakos/oa2 directory
PEP8 fixes on snf-astakos-app/astakos/quotaholder_app directory
PEP8 fixes on snf-astakos-app/astakos directory
PEP8 fixes on snf-branding directory
PEP8 fixes on snf-common directory
PEP8 fixes on snf-cyclades-app/synnefo/admin directory
PEP8 fixes on snf-cyclades-app/synnefo/api directory
PEP8 fixes on snf-cyclades-app/synnefo/app_settings directory
PEP8 fixes on snf-cyclades-app/synnefo/db directory
PEP8 fixes on snf-cyclades-app/synnefo/helpdesk directory