Bump version.
Add PRNG option for config objects.
Add example for custom PRNG.
Merge pull request #19 from heydenberk/byoprng

BYOPRNG
Add seedrandom dependency.
Add seed argument; use seedrandom if seed but not prng provided.
Add seed example.
Merge pull request #20 from heydenberk/seeded_prng

Seeded prng
Add TOC and changelog to README.
Merge pull request #21 from heydenberk/changelog_and_toc

Changelog and toc
Merge pull request #16 from heydenberk/0.4

0.4