LibreSignage v1.1.0-beta-2 release

This is the second beta release for LibreSignage v1.1.0. The full
changelog is included below.

Major changes:

  - A rewrite of the server-side API system. (beta-1)
  - Major backend code improvements. (beta-1)
  - Support for HTTP caching slides resources. (beta-1)
  - A data migration system for simplifying upgrades
    between LibreSignage versions. (beta-2)

You can begin testing this release by either building from source or by
using the prebuilt Docker images from Docker Hub. The readme has
instructions for building LibreSignage by yourself. Docker images will
appear in the Docker Hub repository as `eerotal/libresignage:v1.1.0-beta-2`
shortly after this tag is pushed into the LibreSignage repository.

Please report any bugs and issues you find in the GitHub bug tracker at
https://github.com/eerotal/LibreSignage/issues

Changelog:

v1.1.0
  - [internal] Separate private and public files in the directory tree
               to naturally prevent access to private files. (PR #56)
  - [feature]  Implement [bgimg] and [bgcolor] markup tags for styling
               slide backgrounds. (issue #75)
  - [feature]  Implement buttons for manual slide navigation in display.
  - [internal] Mostly rewrite the API system
  - [internal] Use PHP autoloading and namespaces instead of direct
               file includes.
  - [internal] Improve various classes and PHP files to make them more object
               oriented.
  - [internal] Implement a testing framework with PHPUnit and write tests
               for all API endpoints.
  - [bugfix]   Fix various bugs in the backend that were discovered while
               writing tests.
  - [build]    Make the build system more modular.
  - [build]    Write separate interactive and CLI versions of the apache2-debian
               target. (apache2-debian-interactive and apache2-debian)
  - [build]    Various improvements to the build system.
  - [docs]     Generate documentation with Doxygen.
  - [internal] Implement HTTP cache support for slide asset fetching endpoints.
               (issue #53)
  - [bugfix]   Fix a bug where uploading/removing slide assets was allowed even
               when the slide was not locked. (issue #81)
  - [bugfix]   Fix a bug where a slide could be deleted even when it was
               not locked. (issue #80)
  - [bugfix]   Fix a bug where an error was thrown when changing queues if an
               unsaved slide was open. (#86)
  - [feature]  Implement a data migration system for simplifying upgrades
               between different versions of LibreSignage.
  - [bugfix]   Fix outdated information in documentation.

List of contributors and the number of commits by each one:

 22  Derek Chafin
324  Eero Talus
This tag has no release notes.