added a RandomHash() static method to hash::Any to generate a purely random hash
add a Randomizable() method to hash::Digest that produces a fully random hash
make Smallhash friends with T_Smallhash::InsertAndCopyMd5 testcase
add two MD5 test cases (InsertMd5 an InsertAndCopyMd5)
check max_collisions_
Merge pull request #183 from reneme/test_hash_copy

TEST: Smallhash with MD5 as key (+ copy stress test)