Perf improvements:
a) Batch clearing also of array of states (booleans), since it shows
performance benefits.
b) Removed useless clearing of keys/values while reallocating the
HashMap/Sets
c) Added back strategy() getter, adeed newInstanceXXX without
perturbations with full control (capacity, load factor, strategy)
d) Better startegies-related Javadocs
Tweak generation to prevent '(unnecessary)primitive type cast' warnings
Fix ObjectObjectOpenHashMapBenchmark to remove accidental autoboxing + bumped to 5 Million elemnent test arrays
Merge branch 'hash-strategy-for-map-sets' of https://github.com/vsonnier/hppc into hash-strategy-for-map-sets

Conflicts:
	binaries/hppc-0.6.0-SNAPSHOT-jdk15.jar
	binaries/hppc-0.6.0-SNAPSHOT-sources.jar