Adjust for conda-build 2.0.

Conda test environment has been renamed from _test to _t_env and
has been moved to a temporary directory.

Author: pavoljuhas

Diff for: .travis.yml

@@ -75,8 +75,10 @@ before_install:
   - $NOAPT || popd
 
 install:
-  - $NOMC || conda build conda-recipe
-  - $NOMC || conda list --name=_test --export ${MYNAME} > /tmp/mypackage.txt
+  - $NOMC || conda build --keep-old-work conda-recipe
+  - $NOMC || MYCONDATESTENV="$(ls -td ~/mc/conda-bld/conda-recipe_*/_t_env | head -1)"
+  - $NOMC || source activate ${MYCONDATESTENV:?"conda test environment not found"}
+  - $NOMC || conda list  --export ${MYNAME} > /tmp/mypackage.txt
   - $NOMC || source activate testenv
   - $NOMC || conda install --yes --use-local --file=/tmp/mypackage.txt
   - $NOMC || conda install --yes cxxtest scons