More types of Button

[afc163]

• Button[type="danger"]：close Button 增加 danger type #1308
• Add Button[ghost] property：close Button type="ghost" change to a property ghost #4625
  

[mention-bot]

@afc163, thanks for your PR! By analyzing the history of the files in this pull request, we identified @benjycui, @ddcat1115 and @simaQ to be potential reviewers.

[coveralls]

Coverage remained the same at 77.093% when pulling a7f66e61edf7a053c3026992a86055a75903f3fa on feat-new-button-type into bcd3b63 on feature-2.7.

[coveralls]

Coverage remained the same at 77.093% when pulling 1f7a1fe on feat-new-button-type into bcd3b63 on feature-2.7.

[coveralls]

Coverage remained the same at 77.093% when pulling 1f7a1fe on feat-new-button-type into bcd3b63 on feature-2.7.

[coveralls]

Coverage remained the same at 77.093% when pulling b30ae11 on feat-new-button-type into 0939718 on feature-2.7.

[coveralls]

Coverage remained the same at 77.093% when pulling b30ae11 on feat-new-button-type into 0939718 on feature-2.7.

[coveralls]

Coverage remained the same at 77.093% when pulling 89f8a47 on feat-new-button-type into 0939718 on feature-2.7.