Updated to complete using part of the target name and absolute paths.

[nielshaandbaek]

The purpose of this PR is to make the completion functionality a bit smarter, and able to complete build targets based only on part of the name. If you have build targets such as:

  //exp-compute/hw/ipp/hdl/IppSynth
  //exp-compute/hw/ipp/hdl/Lint
  //exp-compute/hw/ipp/sim/Simulation

With this work as a user one can do e.g.

$ dbt build ipp

and hit tab which will replace your command line with

$ dbt build //exp-compute/hw/ipp/

and show the options of the three actual targets.