Add fallback implementation for BLAS [sd]gemv_.

Fix problems found on buildbots

Update news to include topk ops.

In make_node, always call as_tensor_variable. (not a problem most of the time as not used directly by user.

Remove ViewOp subclass during optimization

Prepare release 0.10.0beta3

TopKOp implementation

Revert part of "Alloc OpRemove to accept a class to remove. Tested by test_gradien.py:test_grad_clip"

This reverts part of commit 0e2d7a79.

We don't need that and it is safer to not introduce it.

Fix min function to work with uint* and bool

Fix conda package builds

Fix pygpu dev version parsing