gradle: Use groovy spread operator

Replace .collect{it.foo} with *.foo.

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
gradle: Tweak blank line locations for echo/bndproperties

This groups the task's name, output by gradle, with the task's output.

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
Merge pull request #588 from bjhargrave/gradle-fixes

Gradle fixes