Incorporating core package into umbrella coverage.

Also updating Travis config to incorporate core package.

.coveragerc

@@ -6,8 +6,6 @@ omit =
     */_generated/*.py
     # Packages in the "google.cloud" package that we don't own.
     */google/cloud/gapic/*
-fail_under = 100
-show_missing = True
 exclude_lines =
     # Re-enable the standard pragma
     pragma: NO COVER

.travis.yml

@@ -6,9 +6,12 @@ install:
 
 script:
   - tox -e py27
+  - (cd core && tox -e py27)
   - tox -e py34
+  - (cd core && tox -e py34)
   - tox -e lint
   - tox -e cover
+  - (cd core && tox -e cover)
   - tox -e system-tests
   - tox -e system-tests3
   - scripts/update_docs.sh

tox.ini

@@ -12,6 +12,13 @@ covercmd =
       --cov=unit_tests \
       --cov-config {toxinidir}/.coveragerc \
       unit_tests
+    py.test --quiet \
+      --cov=google.cloud \
+      --cov=unit_tests \
+      --cov-append \
+      --cov-config {toxinidir}/.coveragerc \
+      core/unit_tests
+    coverage report --show-missing --fail-under=100
 
 [testenv]
 commands =