Pin netCDF4 to v1.2.8 everywhere

v1.2.9 honors `valid_min` and `valid_max` to mask data.  This messes up
working with data that did a sloppy job in maintaining these valid
ranges.  To learn about progress, follow:

- <https://github.com/Unidata/netcdf4-python/issues/711>
- <https://github.com/Unidata/netcdf4-python/issues/703>

_env_templates/py2_pyngl.yml

@@ -22,7 +22,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pyngl

_env_templates/py2_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_env_templates/py3_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_env_templates/pyferret.yml

@@ -4,5 +4,6 @@ channels:
   - {anaconda}
 dependencies:
   - matplotlib=1.5.3
+  - netCDF4=1.2.8
   - pyferret
   - ferret_datasets

_envs_hlrn/py2_pyngl.yml

@@ -22,7 +22,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pyngl

_envs_hlrn/py2_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_hlrn/py3_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_hlrn/pyferret.yml

@@ -4,5 +4,6 @@ channels:
   - file://home/b/shkifmwr/TM/data/conda_mirror/anaconda_local_mirror/
 dependencies:
   - matplotlib=1.5.3
+  - netCDF4=1.2.8
   - pyferret
   - ferret_datasets

_envs_nesh/py2_pyngl.yml

@@ -22,7 +22,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pyngl

_envs_nesh/py2_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_nesh/py3_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_nesh/pyferret.yml

@@ -4,5 +4,6 @@ channels:
   - https://repo.continuum.io/pkgs/free
 dependencies:
   - matplotlib=1.5.3
+  - netCDF4=1.2.8
   - pyferret
   - ferret_datasets

_envs_vulcanus/py2_pyngl.yml

@@ -22,7 +22,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pyngl

_envs_vulcanus/py2_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_vulcanus/py3_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

_envs_vulcanus/pyferret.yml

@@ -4,5 +4,6 @@ channels:
   - file://media/wrath/wrath_003/conda_mirror/anaconda_local_mirror/
 dependencies:
   - matplotlib=1.5.3
+  - netCDF4=1.2.8
   - pyferret
   - ferret_datasets

envs/py2_pyngl.yml

@@ -22,7 +22,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pyngl

envs/py2_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

envs/py3_std.yml

@@ -26,7 +26,7 @@ dependencies:
   - matplotlib=1.5.3
   - mtspec
   - nco
-  - netCDF4
+  - netCDF4=1.2.8
   - numpy
   - pandas
   - pytables

envs/pyferret.yml

@@ -4,5 +4,6 @@ channels:
   - https://repo.continuum.io/pkgs/free
 dependencies:
   - matplotlib=1.5.3
+  - netCDF4=1.2.8
   - pyferret
   - ferret_datasets