Support for temporarily publishing to Bintray

[aleksandr-vin]

While I'm developing in a fork, and the process of reviewing/merging/releasing my PR is ongoing, I'd like to temporarily publish my custom version to Bintray.

I've followed https://github.com/sbt/sbt-bintray instructions but still see two issues:

• added licenses are ignored (worked around by setting bintrayOmitLicense := true)
• still sbt publish tries to publish to oss.sonatype.org, ignoring bintray settings.

build.sbt looks complicated and it seems that temporarily added bintray settings are overwritten at the end.

[BenFradet]

doesn't seem to be related to this repo per se, closing.