support recurrent with no states.#1113

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Beronx86 wants to merge 7 commits intomila-iqia:masterfrom

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Commits on Jun 8, 2016

Commits on Jun 14, 2016

Commits on Jun 15, 2016

a test case for nested recurrent model. assert there is only one top_brick
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Commits on Jun 20, 2016

revert back the change in BaseRecurrent.initial_states
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remove recurrent_with_no_states test case, since the above change would not pass this case.
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