Run daily releases of the manager on all platforms

Respond to review comments:

 * Remove redundant build step in the shadowbox unit testing workflow
 * Add a testing step to the shadowbox release Travis workflow

Respond to review comments:

 * Remove redundant build step in the shadowbox unit testing workflow
 * Add a testing step to the shadowbox release Travis workflow

Remove test config from Travis

Fix broken Travis config

* Doesn't also build the Linux or Mac manager on server deploy
* Correctly builds a Windows binary on manager release (although we still have to manually upload build artifacts)
* Renames the Shadowbox deployment step

Fix broken Travis config

* Doesn't also build the Linux or Mac manager on server deploy
* Correctly builds a Windows binary on manager release (although we still have to manually upload build artifacts)
* Renames the Shadowbox deployment step

Release Shadowbox version 1.6.0 (Jigsaw-Code#791)

Merge pull request Jigsaw-Code#763 from Jigsaw-Code/bemasc-release

Release 1.5.3 (outline-ss-server 1.3.3)

Merge pull request Jigsaw-Code#761 from Jigsaw-Code/fortuna-release

Release 1.5.2 (o-ss-s 1.3.2)

Merge pull request Jigsaw-Code#755 from Jigsaw-Code/fortuna-release

Release outline-ss-server v1.3.1