DOC: Fix typo in np.random.choice documentation

np.random.permutation returns an array, which can be sliced.
Merge pull request #4394 from ariddell/patch-1

DOC: Fix typo in np.random.choice documentation
MAINT: add python3.4 to paver file
Merge pull request #4396 from juliantaylor/paver-3.4

MAINT: add python3.4 to paver file