New features

#2752055: Make caching language aware Make caching language aware

* Issue #2788045: Node import rollback/delete if invalid
* Issue #2597269: Import nodes from node export files
* Issue #2774773: Remove @file tag docblock from all the namespaced .php files.
* Remove unused variables in Redirect class.
* Add support for importing redirects from csv text files.
https://www.drupal.org/node/2717339

Changes since 8.x-1.0-alpha1:

• #2787209 by jhedstrom: Support configurable metadata for the exported xls file
• #2788165 by jhedstrom: Add some tests

Changes since 7.x-3.14:

Porting module to Drupal 8.

Added multilingual support. Needs further testing