Release v1.4.3

IMPROVEMENTS:

• Pluggable architecture for authentication APIs. (#4)
• Accept Weak ETag for WebDAV. (#5)

MODIFICATIONS FOR SECURITY:

• Abolished temporarily Unit User Promotion PROPPATCH API. (#11).

BUG FIXES:

• Test bar file resources are not proper in 1.4.2 . (#7)
• Remove PMD warnings and Checkstyle errors. (#8)
• Fixed a problem about Cell Administration privilege p:root.