update .gitignore and .travis.yml after rebase

Author: JessicaS11

.gitignore

@@ -109,3 +109,11 @@ venv.bak/
 
 # directory files
 .DS_Store
+
+# data files
+*.h5
+*.hdf
+*.hdf5
+*.csv
+*.zarr
+*.tif

.travis.yml

@@ -14,10 +14,7 @@ stages:
 jobs:
   include:
     - stage: basic tests
-      script: pytest icepyx/tests/test_APIformatting.py
-              icepyx/tests/test_geospatial.py
-              icepyx/tests/test_is2ref.py
-              icepyx/tests/test_validate_inputs.py
+      script: pytest icepyx/ --ignore icepyx/tests/behind_NSIDC_API_login.py
       after_success: codecov
 
     # - stage: behind Earthdata