Release Name: 0.16.5

Notes:
Framework for dynamically generating and loading C extensions from Ruby
programs. Includes CShadow module for defining classes in terms of C structs
with accessors and inheritance.



Changes:
cgen 0.16.5

  - api addition: define_inheritable_c_function
  
  - optimization: if mark and free same as parent class
    implementation, reference the latter directly
  
  - optimization: preserve Makefile mtime when nothing changes
  
  - optimization: do not generate load and dump methods when
    super implementation is equivalent
  
  - optimization: if mark or free do nothing, don't generate a function,
    just use 0 or -1 (resp.) in Data_Make_Struct