Smack 4.0.6-SNAPSHOT
Fallback to host if DNS SRV lookup fails

Also fix javadoc for DNSUtil, _jabber SRV records are no longer tried.

Fixes SMACK-616.
Make digest() in EntityCapsManager synchronized

Fixes SMACK-617
Add version.gradle
Smack 4.0.6
Merge tag '4.0.6'

Smack 4.0.6

Conflicts:
	smack-core/src/main/java/org/jivesoftware/smack/util/DNSUtil.java
	smack-extensions/src/main/java/org/jivesoftware/smackx/caps/EntityCapsManager.java
	version.gradle