Added post render and cache tag support if https://drupal.org/node/2217877 is committed to core.
Add UUID to the embed if it wasn't already there.
Merge branch '8.x-1.x' into core-2217877-applied

Conflicts:
	lib/Drupal/entity_embed/Plugin/Filter/EntityEmbedFilter.php
Just reuse Html::normalize() for the alternate placeholder instead of manual string replacement.
Clarify some confusing comments.
Split out returning #post_render_cache and #cache tags in filter results.
Merge branch '8.x-1.x' into core-2217877-applied

Conflicts:
	lib/Drupal/entity_embed/Plugin/Filter/EntityEmbedFilter.php
Merge branch '8.x-1.x' into core-2217877-applied

Conflicts:
	lib/Drupal/entity_embed/Plugin/Filter/EntityEmbedFilter.php
Fixed use of confusing properties and methods by just passing the $build render array into buildPlaceholder().
Merge branch '8.x-1.x' into core-2217877-applied

Conflicts:
	lib/Drupal/entity_embed/Plugin/Filter/EntityEmbedFilter.php
Ensure post_render_cache placehold is replaced when exceptions are caught.
Use get_called_class() instead of hard-coding post_render_cache callback.
Added README note about core patch.
Merge pull request #6 from drupal-media/core-2217877-applied

Add support for #post_render_cache rendering of entities and cache tag support