Changes

• Rewrite XHR code using Axios (#1361) @lindapaiste
• docs: add adrianfiedler as a contributor for doc (#1360) @allcontributors
• Remove non existing example links from dcgan.md (#1358) @adrianfiedler
• docs: add yoychen as a contributor for doc (#1357) @allcontributors
• docs: fix markdown format in feature-extractor (#1226) @yoychen
• Restore missing K-Means CSV files. Slight changes to example text. (#1342) @lindapaiste