Fix #227 Optimize xitrum.util.Json by avoid creating formats at every call
Fix #71 (CORS) and #209 (OPTIONS)
Merge branch 'master' of https://github.com/ngocdaothanh/xitrum
Handle 404 for OPTIONS
Update CHANGELOG
Update akka-slf4j to 2.2.3
Fix #222 Update Knockout.js from 2.3.0 to 3.0.0
Change sbt-pgp from 0.8.2 (nonexistent) to 0.8.1
Add https://github.com/georgeOsdDev/xitrum-placeholder
Release Xitrum 2.11
Update CHANGELOG
#71 Remove debug println
Fix NPE on startup when no template engine is configured
Merge branch 'master' of https://github.com/ngocdaothanh/xitrum