Fixes slow atomic operation possibly overriding newer values.
Adds Settings.getSecret API.
Adds StringUtils.hmac and hmacSha1 methods.
Merge branch 'release/2.0'

Conflicts:
	util/src/main/java/com/psddev/dari/util/Settings.java
	util/src/main/java/com/psddev/dari/util/StringUtils.java