Implements .eq
Implements expect syntax
Allows "actual" to be nil for one arg matchers
Implements .be_true
Implements .be_truthy
Implements be_falsey
Implements .be_nil
Implements .have_key
Implements .be_empty
Better algorithm for be_empty
Implements .include
Implements proper support for single-value matchers
Implements .be_empty support for Strings
Updates documentation with new matchers
Merge pull request #5 from sproutapp/matchers

Implements "expects" syntax with core matchers