.travis.yml: fail build when one of commands fails.

Correction for 4b94639 commit.

Author: php-coder

.travis.yml

@@ -2,14 +2,14 @@ language: java
 before_script:
   - npm install -g bootlint
 script:
-  - mvn --batch-mode checkstyle:check -Dcheckstyle.violationSeverity=warning | egrep -v '^\[INFO\] Download(ing|ed):' | tee cs.log; fgrep -qs '[ERROR]' cs.log && false || true
-  - mvn --batch-mode pmd:check | egrep -v '^\[INFO\] Download(ing|ed):' | tee pmd.log; fgrep -qs '[ERROR]' pmd.log && false || true
-  - mvn --batch-mode license:check | egrep -v '^\[INFO\] Download(ing|ed):' | tee licence.log; fgrep -qs '[ERROR]' licence.log && false || true
+  - mvn --batch-mode checkstyle:check -Dcheckstyle.violationSeverity=warning | egrep -v '^\[INFO\] Download(ing|ed):' | tee cs.log; ! fgrep -qs '[ERROR]' cs.log
+  - mvn --batch-mode pmd:check | egrep -v '^\[INFO\] Download(ing|ed):' | tee pmd.log; ! fgrep -qs '[ERROR]' pmd.log
+  - mvn --batch-mode license:check | egrep -v '^\[INFO\] Download(ing|ed):' | tee licence.log; ! fgrep -qs '[ERROR]' licence.log
   - find src -type f -name '*.html' | xargs bootlint
-  - mvn --batch-mode verify | egrep -v '^\[INFO\] Download(ing|ed):' | tee verify.log; fgrep -qs '[ERROR]' verify.log && false || true
-  - mvn --batch-mode jasmine:test | egrep -v '^\[INFO\] Download(ing|ed):' | tee jasmine.log; fgrep -qs '[ERROR]' jasmine.log && false || true
+  - mvn --batch-mode verify | egrep -v '^\[INFO\] Download(ing|ed):' | tee verify.log; ! fgrep -qs '[ERROR]' verify.log
+  - mvn --batch-mode jasmine:test | egrep -v '^\[INFO\] Download(ing|ed):' | tee jasmine.log; ! fgrep -qs '[ERROR]' jasmine.log
 after_success:
-  - mvn --batch-mode jacoco:prepare-agent test jacoco:report coveralls:jacoco | egrep -v '^\[INFO\] Download(ing|ed):' | tee jacoco.log; fgrep -qs '[ERROR]' jacoco.log && false || true
+  - mvn --batch-mode jacoco:prepare-agent test jacoco:report coveralls:jacoco | egrep -v '^\[INFO\] Download(ing|ed):' | tee jacoco.log; ! fgrep -qs '[ERROR]' jacoco.log
 
 jdk:
   - oraclejdk8