translate write-documentation.markdown into Japanese
fix typo
fix typo
Merge pull request #2599 from kachick/fix-file-expand_path-encoding

Fix #2597
Merge pull request #2593 from utenmiki/translate

translate write-documentation.markdown into Japanese
Add Module#name specs for mainly about anonymous modules

`name.to_s.should == ""` is keeping compatibility for 1.8 with 1.9+
Add Module#const_set specs for anonymous modules

`name.to_s.should == ""` is keeping compatibility for 1.8 with 1.9+
Fix Module#const_set for anonymous modules