Add option to search command to output the results as a list of identifiers

[bhermann]

Is your feature request related to a problem? Please describe.
End-users might want to pipe the output of the CLI to another process directly.

Describe the solution you'd like
The result output should be a newline separated list of identifiers.
Example:

org.jglobus:JGlobus-Core:2.0.3      
org.jruby:jruby:1.2.0          
org.jglobus:JGlobus-Core:2.0.0  
org.jglobus:JGlobus-Core:2.0.1     
org.jruby:jruby:1.2RC1                  
org.objectweb.clif:clif-without-fractal:1.3.0 
org.jruby:jruby:1.2.0RC2    
org.jglobus:JGlobus-Core:2.0.2

Describe alternatives you've considered
none

Additional context
none