Merge pull request #205 from SpineEventEngine/address-stale-subscript…

…ion-cancellation

[1.x] Delete Firebase nodes for stale topics

Merge pull request #201 from SpineEventEngine/release-web-1.9.0

Release 1.9.0

Merge pull request #184 from SpineEventEngine/release-1.8.2

Release 1.8.2

Merge pull request #176 from SpineEventEngine/release-1.8.0

Release 1.8.0

Batch keep-up and cancel requests for 1.x

Improve Javadoc

Merge pull request #167 from SpineEventEngine/expose-testutils

Publish `spine-testutils-web`

Merge pull request #161 from SpineEventEngine/release/v1.7.0

Release v1.7.0

Merge pull request #152 from SpineEventEngine/release-1.6.0

Release `1.6.0`

Merge pull request #134 from SpineEventEngine/release-1.5.0

Release 1.5.0