Release 2.0-2:
  * Minor internal re-organization.
  * Minor documentation fix for CRAN.

Release 2.0-1:
  * Fixed incorrect pop/popback behavior.
  * Register native routines.
  * Fixed int comparison warnings (-Wextra).

Release 2.0-0:
  * Added queues and stacks.
  * Fixed segfault in combine()
  * Re-wrote README.
  * Refactored internals.
  * Improved documentation.

Release 1.0-0:
  * Added support for deques and basic deque operations.
