Added mention of binary distribution (clab#1234)

underflow problems were causing some spurious failures with the new s…

…tricter grad check

dynet-849. Fix GRUBuilder self._spec bug. (clab#851)

Former-commit-id: 87df341

Merge pull request clab#679 from clab/nodes-separate-final

Separate nodes into different files

Former-commit-id: 9606e2a

Small fix to doc

Former-commit-id: 78f7bed

Updated dynet to use initialization

Former-commit-id: b0041d7