Fit the borderline to the world
Use MonadRandom
Insert plants with folding
fix doctest
Merge pull request #1 from swtw7466/remove-recursion

明示再帰除去
Merge pull request #3 from swtw7466/fit-border

境界線を世界の大きさに合わせる
Merge pull request #4 from swtw7466/use-monad-random

MonadRandom
add doctest runner
Enable cabal test
Add .travis.yml
Add the first creature
Use integral operation
fix warnings
Add creature genes
Merge pull request #5 from swtw7466/first-creature

最初の動物
Merge pull request #6 from swtw7466/add-gene

遺伝子情報追加
Avoid dispersion of type constructors: initGene
Avoid dispersion of type constructors: newDirection
Avoid dispersion of type constructors: fix doctest
Add type Plants