Removing unnecessary tests

.travis.yml

@@ -96,31 +96,6 @@ matrix:
           env: SETUP_CMD='build_docs -w'
                CONDA_DEPENDENCIES=$CONDA_DEPENDENCIES_DOC
 
-        # Now try Astropy dev with the latest Python and LTS with and 3.x.
-        - os: linux
-          env: ASTROPY_VERSION=development
-               EVENT_TYPE='pull_request push cron'
-        - os: linux
-          env: PYTHON_VERSION=3.6 ASTROPY_VERSION=lts NUMPY_VERSION=1.13
-
-        # Add a job that runs from cron only and tests against astropy dev and
-        # numpy dev to give a change for early discovery of issues and feedback
-        # for both developer teams.
-        - os: linux
-          stage: Cron tests
-          env: ASTROPY_VERSION=development NUMPY_VERSION=development
-               EVENT_TYPE='cron'
-
-        # Try all python versions and Numpy versions. Since we can assume that
-        # the Numpy developers have taken care of testing Numpy with different
-        # versions of Python, we can vary Python and Numpy versions at the same
-        # time.
-
-        - os: linux
-          env: PYTHON_VERSION=3.6 NUMPY_VERSION=1.14
-        - os: linux
-          env: NUMPY_VERSION=1.15
-
         # Do a PEP8 test with flake8
         - os: linux
           stage: Initial tests