0.2.0

Added

• Scratchpad::static_new() function for creating scratchpads backed by
  static arrays without having to pass array instances as function parameters.
• StaticBuffer trait for constraining Scratchpad::static_new() to
  scratchpads that use only static arrays for backing storage.
• cache_aligned_zeroed!(), cache_aligned_zeroed_for_bytes!(), and
  cache_aligned_zeroed_for_markers!() macros for shorthand creation of
  zeroed-out CacheAligned data.
• References to MarkerFront and MarkerBack in documentation for Marker.
• Run tests with both the std and unstable crate features enabled in
  Travis CI configuration.
• "data-structures" and "embedded" categories in Cargo.toml manifest.
• Documentation link in Cargo.toml manifest.
• Documentation and release nodes links in README.md.
• Changelog.

Changed

• Clarified how the front and back allocation stacks operate independently in
  documentation.
• Use clearer wording in "Memory Overhead" documentation section.
• Minor documentation tweaks.

Removed

• References to creating static instances of Scratchpad from documentation
  (static variables must implement Sync, but Scratchpad is not thread-safe
  by design).

Fixed

• Incorrect "deque" term use internally.