send coverage data to coveralls

tool/travis.sh

@@ -18,3 +18,13 @@ dart test/all.dart
 
 # Run all the generators and analyze the generated code.
 dart tool/grind.dart test
+
+# Install dart_coveralls; gather and send coverage data.
+if [ "$COVERALLS_TOKEN" ]; then
+  pub global activate dart_coveralls
+  pub global run dart_coveralls report \
+    --token $COVERALLS_TOKEN \
+    --retry 2 \
+    --exclude-test-files \
+    test/all.dart
+fi