Add MyGet service

Add www.myget.org service
Update myget_test.rb
Adding Leanpub service
Update leanpub_test.rb

It's LeanpubTest, not LeanpubText
Update myget.rb
Merge pull request #805 from myget/master

Add MyGet service
Merge pull request #806 from spatten/master

Adding Leanpub service