Merge pull request #571 from jvesely/cuda_test

pygpu/tests: Skip tests that require CUDA context if the context is not CUDA

Merge pull request #553 from pambros/master

add CUDA 9 version when trying to load libnvrtc

Merge pull request #548 from abergeron/conda_libc

Change base build image to accomodate for old libc.

Use the right encrypted token for appveyor.

Merge pull request #526 from notoraptor/fix-memory-leak-libgpuarray

Fix some memory leaks in libgpuarray

Merge pull request #525 from abergeron/circleci

Enable build on tags for CircleCI.

Merge pull request #524 from abergeron/circleci

Fix syntax on travis.

Merge pull request #512 from abergeron/better_conda

Better conda

Changes for release 0.7.0

Merge pull request #507 from abergeron/coll_byte

Remove tests with BYTE since that is not supported on many MPI implementations