Merge pull request tensorlayer#24 from Yugnaynehc/Yugnaynehc-patch-fi…

…x-cost-typo

[docs] Fix type of tl.cost.cross_entropy,  tl.cost.binary_cross_entropy and dropneuro.

release 1.2.6

[TEST] TensorFlow 10, 11 Python 2, 3

release 1.2.2b

add SlimNetsLayer and Inception V3 example / Merge TF-Slim into Tenso…

…rLayer

Maintainance release 1.2.1

Release Version 1.2