Fix the Travis badge in README
Merge pull request #519 from miikka/patch-1

Fix the Travis badge in README
Improvements to InstrumentedExecutorServiceTest
Upgraded to Guava 15.0.
Upgraded to Apache HttpClient 4.3.1.
Upgraded to Jersey 1.18.
Upgraded Maven plugins.
Upgraded to Jackson 2.3.0.
Upgraded to Jetty 8.1.14.
Upgraded to Jetty 9.0.7.
Upgraded to Logback 1.1.0.
Upgraded to Jackson 2.3.1.
Upgraded to Apache HttpClient 4.3.2.
Upgraded to Guava 16.0.
Upgraded to Ehcache 2.6.8.
Upgraded to Guava 16.0.1.