Fix wrapper

This pullrequest tries to fix the wrapper-issue #1.

After running ```gradle wrapper``` the gradle-wrapper.jar was added, gradle-wrapper.properties and gradlew.bat were updated by this task because the version of gradle was updated to 1.7-rc-2.

Using Gradle via ```./gradlew build``` should be working now, but there are some compile-errors, imports have to be fixed and to retrieve the latest snapshot of reactor the ```lib-snapshots```-repository had to be added.

Some files/folders generated by Eclipse/STS were added to the ```.gitignore``` file.