Implement Hash#clear.
Test for Hash#clear.
Better test for Hash#clear.
Actually implement the low-level stuff so that it works when we don't have all of Python available.
Better implementation of (and test for) OrderedDict ll_clear().
Add myself to AUTHORS, because the docs told me to.
Remove unnnecessary variable assignment.
readme typo fix
hash is Enumerable
Merge pull request #352 from jerith/jerith/Hash#clear

Hash#clear
simpler condition
Merge pull request #358 from goshakkk/readme-typo

Readme typo fix
Merge pull request #363 from goshakkk/hash-enumerable

Hash is Enumerable
added Hash#initialize_copy and Hash#shift
this spec passes
implement Hash#replace
Merge pull request #361 from goshakkk/hash-replace

Implement Hash#replace
remove initialize_copy,it's the same as replace