fixed
fixed groupIds
Merge branch 'develop'

Conflicts:
	README.md
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
added .travis.yml
Merge branch 'develop'

Conflicts:
	.travis.yml
clean up
updated versions
updated version in pom
update readme
[maven-release-plugin] prepare release xchange-1.8.0
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] rollback the release of xchange-1.8.0
incremented version numbers
[maven-release-plugin] prepare release xchange-1.9.0
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] rollback the release of xchange-1.9.0