Added @marcoboi's client auth PR

Author: velvia

notes/0.8.0.markdown

@@ -15,3 +15,4 @@
 * clean running jobs after context JobManager dies (@krcz)
 * fix for #916,#917: logging for manager_start.sh (@marcoboi) 
 * fix(job-server) store error class and stack trace in database (@krcz)
+* Support for certificate based client authentication (@marcoboi)