Finished writing; Added new hash functions; Different word size support;

1. Added fasthash and reverse mix function
2. Added support for different word sizes (32bit, 64bit)
3. Don't pre-generate number of k and l bits
4. Udated README
5. Fixed bugs in reading and writing to hash table array
6. Various speed ups
7. Added speedtest.c to benchmark
Improve inner loop conditions
Minor tweaks