v2.2.0

• Add striptags filter. Thanks Anthony Giniers. Merge of
  #589.
• Allow compiled templates to be imported, included and extended. Thanks Luis
  Gutierrez-Sheris. Merge of
  #581.
• Fix issue with different nunjucks environments sharing same globals. Each
  environment is now independent. Thanks Paul Pechin. Merge of
  #574.
• Add negative steps support for range function. Thanks Nikita Mostovoy. Merge
  of #575.
• Remove deprecation warning when using the default filter without specifying
  a third argument. Merge of
  #567.
• Add support for chaining of addGlobal, addFilter, etc. Thanks Rob Graeber. Merge of
  #537
• Fix error propagation. Thanks Tom Delmas. Merge of
  #534.
• trimBlocks now also trims windows style line endings. Thanks Magnus Tovslid. Merge of
  #548
• include now supports an option to suppress errors if the template does not
  exist. Thanks Mathias Nestler. Merge of
  #559