def top_crashes(version, build)
      @version = version
      @build = build
      @crashes = @crash_source.crashes(@top, version, build, @show_only_unresolved)
      @total_crashes = @crash_source.crash_count(version: @version, build: @build)
      report
    end
def top_crashes(version, build)
      @version = version
      @build = build
      @crashes = @crash_source.crashes(@top, version, build, @show_only_unresolved)
      @total_crashes = @crash_source.crash_count(version: @version, build: @build)
      report
    end
returns list of top crashes for the given build