Use pip for pytest-packages

_env_templates/py2_parcels.yml

@@ -14,11 +14,11 @@ dependencies:
   - progressbar2
   - py>=1.4.27
   - pymbolic
-  - pytest-ipynb
-  - pytest>=2.7.0
   - python-dateutil
   - scipy>=0.16.0
   - six>=1.10.0
   - xarray>=0.5.1
   - pip:
+      - pytest-ipynb
+      - pytest>=2.7.0
       - "git+{git_protocol}https://github.com/OceanParcels/parcels.git@v0.9"

_envs_hlrn/py2_parcels.yml

@@ -14,11 +14,11 @@ dependencies:
   - progressbar2
   - py>=1.4.27
   - pymbolic
-  - pytest-ipynb
-  - pytest>=2.7.0
   - python-dateutil
   - scipy>=0.16.0
   - six>=1.10.0
   - xarray>=0.5.1
   - pip:
+      - pytest-ipynb
+      - pytest>=2.7.0
       - "git+ssh://git@https://github.com/OceanParcels/parcels.git@v0.9"

_envs_nesh/py2_parcels.yml

@@ -14,11 +14,11 @@ dependencies:
   - progressbar2
   - py>=1.4.27
   - pymbolic
-  - pytest-ipynb
-  - pytest>=2.7.0
   - python-dateutil
   - scipy>=0.16.0
   - six>=1.10.0
   - xarray>=0.5.1
   - pip:
+      - pytest-ipynb
+      - pytest>=2.7.0
       - "git+ssh://git@https://github.com/OceanParcels/parcels.git@v0.9"

_envs_vulcanus/py2_parcels.yml

@@ -14,11 +14,11 @@ dependencies:
   - progressbar2
   - py>=1.4.27
   - pymbolic
-  - pytest-ipynb
-  - pytest>=2.7.0
   - python-dateutil
   - scipy>=0.16.0
   - six>=1.10.0
   - xarray>=0.5.1
   - pip:
+      - pytest-ipynb
+      - pytest>=2.7.0
       - "git+https://https://github.com/OceanParcels/parcels.git@v0.9"

envs/py2_parcels.yml

@@ -14,11 +14,11 @@ dependencies:
   - progressbar2
   - py>=1.4.27
   - pymbolic
-  - pytest-ipynb
-  - pytest>=2.7.0
   - python-dateutil
   - scipy>=0.16.0
   - six>=1.10.0
   - xarray>=0.5.1
   - pip:
+      - pytest-ipynb
+      - pytest>=2.7.0
       - "git+https://https://github.com/OceanParcels/parcels.git@v0.9"