Update Gson's test protos in gen_tests script.

Also:
 * Affix an extension so IDEA will syntax highlight in Bash.
 * Fail the Travis CI build when the gen_tests.sh script creates uncommited changes.

.travis.yml

@@ -4,6 +4,10 @@ jdk:
   - oraclejdk7
   - oraclejdk8
 
+before_script:
+  - ./gen_tests.sh
+  - if [ ! -z "$(git status --porcelain)" ]; then echo "Test files changed. Did you run gen_tests.sh?"; exit 1; fi
+
 after_success:
   - .buildscript/deploy_snapshot.sh
 

gen_tests → gen_tests.sh

@@ -13,3 +13,5 @@ java -jar ../wire-compiler/target/wire-compiler-*-SNAPSHOT-jar-with-dependencies
   --java_out=../wire-runtime/src/test/java \
   --enum_options=squareup.protos.custom_options.enum_value_option,squareup.protos.custom_options.complex_enum_value_option,squareup.protos.foreign.foreign_enum_value_option \
   ${PROTOS}
+
+cp src/test/java/com/squareup/wire/protos/alltypes/* ../wire-gson-support/src/test/java/com/squareup/wire/protos/alltypes/