Add a --task--preview flag to the query command

This new flag takes arguments for a patchset. Tasks will then be
evaluated as if the patchset were already merged. Multiple changes
may be previewed together.

Change-Id: I87fae8a1bbb91706d170f2fda69b8cfbef84533b
10 files changed
tree: 460c790131c8b4726d68b3fe683395c17dfc407e
  1. src/
  2. test/
  3. .gitignore
  4. pom.xml