Array#rotate
remove tags
clean code
Implement most of Random.rand
Merge branch 'master' into random-rand
Fix naming of methods in W_RandomObject

method_srand is an instance method.
Don't ignore seed in Random.allocate
Use space.w_float instead of getclassfor
Whitespace cosmetics in randomobject.py
Simplify argument's coercion in Random.allocate
tag new spec
Merge pull request #551 from jstepien/random-rand

Random#rand
Merge pull request #547 from kostya/rotate

Array#rotate