Replaced ancient junit dependency with new one for caliper benchmarks
Remove RemoveHashSetBenchmark from caliper suite

RemoveHashSetBenchmark does not measure what it supposed to: state of the set changes during repetitions so time spent in a repetition should vary and it is incorrect to take an average of that time.
Remove RemoveHashSetBenchmark from benchmark list
Remove ContainsNotExistsElementBenchmark from the caliper suite

ContainsNotExistsElementBenchmark does not measure what it is supposed to: every "collisionless" element in the control set actually has at least one same hash code twin in a the tested set.
I can not find a way to implement it right in the case of the managed hash code collisions (same hash code, same hash table index) so I let it go.
Remove ContainsNotExistsElementBenchmark for real

Something went wrong and file deletion was not commited. See description to the previous commit.
Remove odd results from caliper benchmark

Added caliper instrument option to collect only runtime results from benchmarks
Add managed collisions to caliper suite
Merge branch 'new-hashset-impl' of github.com:SoftageRnD/scala into new-hashset-impl

Conflicts:
	caliper_benchmarks/src/main/java/AddHashSetBenchmark.java
	caliper_benchmarks/src/main/java/RemoveHashSetBenchmark.java