Keep the pinned file for conda on CIs

In case we find ourselves needing to pinning things in the `conda`
testing environment in the future, keep the `pinned` files around on CI
even though they are currently empty.

.travis.yml

@@ -47,6 +47,7 @@ install:
    - python setup.py bdist_conda
    # Setup environment for nanshe and install it with all dependencies.
    - conda create --use-local -n testenv python=$PYTHON_VERSION nanshe==$VERSION
+   - touch $HOME/miniconda/envs/testenv/conda-meta/pinned
    - conda update --use-local -n testenv --all
    - conda install --use-local -n testenv nanshe==$VERSION
    - source activate testenv

.wercker.yml

@@ -24,6 +24,7 @@ build:
                 conda create -y --use-local -n testenv nanshe==$(python setup.py --version)
                 source activate testenv
                 conda clean -tipsy
+                touch /opt/conda/envs/testenv/conda-meta/pinned
 
         - script:
             name: Install dependencies for cluster support.