update ignore file
ruby version code for 4,5,6 and 7
Ignore build target folder.
update ruby version code
fix code issues and update comments
Merge pull request #178 from UncleBill/master

Ignore build target folder.
Merge pull request #177 from RONGHAI/master

Ruby Version Code Update
Update Readme.md
Update 27.0.md
Update 27.0.md
Update 23.0.md
Update 34-35.0.md
Update Readme.md
Update Readme.md
Update Readme.md
Update Readme.md
Update Readme.md
Update Readme.md
Update Readme.md
Perfect Shuffle Algorithm