add browse_releases_in_collection()

Signed-off-by: Johannes Dewender <github@JonnyJD.net>
use browsing in collection example

Signed-off-by: Johannes Dewender <github@JonnyJD.net>
rather add browsing to get_releases_in_collection()

This way we don't have two different functions
and browsing is probably something most users want.

Signed-off-by: Johannes Dewender <github@JonnyJD.net>
Merge branch 'browse_collection'

see pull request #88 and issue #128

Signed-off-by: Johannes Dewender <github@JonnyJD.net>