Fix minor spelling and punctuation errors.
Upgrade to latest slf4j and use vararg logging methods.

Switch from String.format to slf4j vararg methods and pattern
syntax.  This reduces code size slightly and should be marginally
more efficient.
Merge remote-tracking branch 'origin/spelling'

Conflicts:
	priam/src/main/java/com/netflix/priam/defaultimpl/StandardTuner.java
Merge remote-tracking branch 'origin/slf4j-upgrade'