4.4.0

• #209: Document and integration-test scoped matchers for mixed Mongoid and ActiveRecord applications using shoulda-matchers - @dblock.
• #210: Support checking nil and blank options on length validators with to_allow - @dblock.
• #161: Add have_and_belong_to_many_related as a nonconflicting alternative when using shoulda-matchers - @dblock.
• #220: Add .readonly to field matchers for fields declared with attr_readonly - @dblock.
• #233: Add with_primary_key for association matchers - @dblock.
• #225: Add an execute_mongodb_command matcher with optional exact command matching - @dblock.
• #235: Remove deprecated RubyForge metadata from the gemspec - @dblock.
• #135: Match requested length options against all applicable validators instead of only the first - @dblock.
• #238: Add a be_covered_query matcher for index-only query plans with optional using_index and using_indexes constraints - @Startouf.
• #252: Fill in historical changelog entries and correct release attribution - @dblock.