tox: default to not using-manylinux ice wheel

.gitignore

@@ -1,3 +1,4 @@
 dist/
 *.egg-info/
-*.pyc
+*.pyc
+.tox/

.travis.yml

@@ -19,7 +19,7 @@ script:
   - python setup.py sdist
   - pip install dist/omero-web*gz
   - python -c "import omeroweb.version as owv; print(owv.omeroweb_version)"
-  - tox
+  - tox -e travis
 
 deploy:
   provider: pypi

tox.ini

@@ -1,5 +1,8 @@
 [tox]
+# Default tox environment when run without `-e`
 envlist = py36
+# Use `-e travis` to speed up travis by installing a pre-built ice wheel
+
 # https://tox.readthedocs.io/en/latest/config.html#conf-requires
 # Ensure pip is new so we can install manylinux wheel
 requires = pip >= 19.0.0
@@ -12,12 +15,13 @@ deps =
     numpy>=1.9
     pytest
     PyYAML
-    py27: tables < 3.6.0
-    py36: tables
+    tables
     # https://github.com/pytest-dev/pytest-xdist/issues/585
     pytest-xdist < 2
     restructuredtext-lint
-    py36: https://github.com/ome/zeroc-ice-py-manylinux/releases/download/0.1.0/zeroc_ice-3.6.5-cp36-cp36m-manylinux2010_x86_64.whl
+    zeroc-ice >3.6,<3.7
+    travis: https://github.com/ome/zeroc-ice-py-manylinux/releases/download/0.1.0/zeroc_ice-3.6.5-cp36-cp36m-manylinux2010_x86_64.whl
+
 
 setenv =
     OMERODIR = {toxinidir}
@@ -32,5 +36,5 @@ commands =
     pip install .
     pytest {posargs:-rf}
 
-[testenv:py36]
+[testenv:travis]
 basepython = python3.6