First steps towards signing

* TODO: provide required properties (see http://www.gradle.org/docs/current/userguide/signing_plugin.html for details)
Added Travis CI integration
Converted from UTF-8 to ASCII
Preparation for Maven central releases

* added signing plugin in build
* sign artifacts
* added details to pom.xml needed for Maven central releases
* updated build-test.gradle
Merge branch 'feature/gradle-signing' into develop
Merge branch 'release/1.0'

Conflicts:
	.travis.yml
	README.md
	src/main/groovy/eu/schnuckelig/gradle/plugins/jaxws/JaxWSTask.groovy
	src/test/groovy/eu/schnuckelig/gradle/plugins/jaxws/JaxWSTaskTest.groovy