(#bz 781829) Add epoch/downgrade crack
    
    The upgrade of rubygem-crack caused dependency issues with the current
    version of httparty, which is utilized by several other packages.
    httparty cannot be upgraded currently due to the newer version having
    different dependencies.
    
    This fix adds an epcoh of 1 and downgrades crack back 0.1.8.
    
    Signed-off-by: Michael Stahnke <stahnma@puppetlabs.com>