Fixed #155 Fixed bad implement, bad data structure CircularBuffer

[daoluong]

Description

fixed issue #155 improve data struct:

• Pop now work like a stack (throw InvalidOperationException when pop an empty CircularBuffer)
• No extra item in the inner array
• Clear array instead of create anew
• Fixed bad implement of IEnumerable (incorrect GetEnumerator, Contains, Remove)

Checklist

• [x] An issue was first created before opening this pull request
• [x] The new code follows the contribution guidelines
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests to ensure that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[hoowee]

您好，您的邮件我已经收到，会尽快处理，谢谢！中建八局设计管理总院 胡伟