* Add missing specs:
  * Add spec file spec/unit/virtus/coercion/time_coercions/to_date_spec.rb for Virtus::Coercion::TimeCoercions#to_date
  * Add spec file spec/unit/virtus/coercion/time_coercions/to_time_spec.rb for Virtus::Coercion::TimeCoercions#to_time
  * Add spec file spec/unit/virtus/coercion/time_coercions/to_string_spec.rb for Virtus::Coercion::TimeCoercions#to_string
  * Add spec file spec/unit/virtus/coercion/time_coercions/to_datetime_spec.rb for Virtus::Coercion::TimeCoercions#to_datetime
  * Add spec file spec/unit/virtus/coercion/decimal/class_methods/to_decimal_spec.rb for Virtus::Coercion::Decimal.to_decimal
  * Add spec file spec/unit/virtus/coercion/float/class_methods/to_float_spec.rb for Virtus::Coercion::Float.to_float
  * Add spec file spec/unit/virtus/coercion/integer/class_methods/to_integer_spec.rb for Virtus::Coercion::Integer.to_integer
  * Add spec file spec/unit/virtus/coercion/numeric/class_methods/to_float_spec.rb for Virtus::Coercion::Numeric.to_float
  * Add spec file spec/unit/virtus/coercion/numeric/class_methods/to_integer_spec.rb for Virtus::Coercion::Numeric.to_integer
  * Add spec file spec/unit/virtus/coercion/numeric/class_methods/to_string_spec.rb for Virtus::Coercion::Numeric.to_string
  * Add spec file spec/unit/virtus/coercion/numeric/class_methods/to_decimal_spec.rb for Virtus::Coercion::Numeric.to_decimal
  * Add spec file spec/unit/virtus/coercion/class_methods/element_reference_spec.rb for Virtus::Coercion.[]
  * Add spec file spec/unit/virtus/coercion/class_methods/primitive_spec.rb for Virtus::Coercion.primitive
  * Add spec file spec/unit/virtus/attributes_accessor/define_writer_method_spec.rb for Virtus::AttributesAccessor#define_writer_method
  * Add spec file spec/unit/virtus/attributes_accessor/inspect_spec.rb for Virtus::AttributesAccessor#inspect
  * Add spec file spec/unit/virtus/attributes_accessor/define_reader_method_spec.rb for Virtus::AttributesAccessor#define_reader_method

* Make #to_time #to_date and #to_datetime work on Ruby 1.8.7 instead of typecasting to string and parsing the value
* Add support for defining attributes on Modules