add index API index action of images fixes spree/spree#5081

add newline to end of file

remove extra line

Closes #5083
Default order_factory line_items_count to 1

This took 40 seconds off of the "core" specs on my computer (3min30s -> 2min50s).  I didn't measure the other suites.
Given the speedup it seems like a reasonable thing to do for the cases where you only really need a single item.

Closes #5085
Improve build.sh output

- Add "--quiet" to "bundle update" to silence gem output
- Highlight the beginning of each suite more with some asterisks

Closes #5086