Add findZLIB in cmake

* Also fix a bug, we should link -ldl at last

Fix signed/unsigned comparison for gcc 4.9

Further fix for memory of RecurrentGradientMachine

Sequences should be sorted according to the number of subsequences they have.

Sequences should be sorted according to the number of subsequences they have.

* try to fix bug for ctc_error_evaluator

Just forget to add deploy_key to this repository.

Change input of ctc error evaluator in the test

to restore successful build status. travis DOCS job on master failed due to permisstion issue: https://travis-ci.org/baidu/Paddle/jobs/159851334  @reyoung, please resolve the permission issue.

* Add documentation build to ci test
* Push master branch doc changes to gh-pages branch

* Add some comments for CTC layer and fix CTC evalutors, also add interface test

Merge Baidu Internal Changes.

Change-Id: I8e0a8ea6fc2760652d9c76440a539c90860062d3

* modify RecurrentGradientMachine to support hasSubSeq sequence inlinks with the same number of sentence but different number of tokens for each sentence

Change-Id: Ic71f00a4bb346b4fa93e650dfb4b1a0d8d2338b0

Change-Id: Id66da7b7f5bf9ec80cc19b347e4fb822a5a6f197

* by default, synchronize default_stream after resizeAndCopyFrom
* add sync in some places after resizeAndCopyFrom using other streams

Change cos_sim to use CosSimLayer layer when size=1 and rename convex_comb_layer to linear_comb_layer     

Change cos_sim to use CosSimLayer layer when size=1 and rename convex_comb_layer to linear_comb_layer

Also add an unittest for layers.py, currently for a few things. More need to be added later.

Update from the original

* fix CUDNN_VERSION for backward of CudnnBatchNormLayer

* fix cudnn version number for BatchNorm

Update from the original

Custom stack trace refines

Lazy install Paddle wheels

Fix a PyDataProvider2 bug when use calc_batch_size

* Need PyGuard when set args for calc_batch_size