Wrong name mangling. V8Utils => v8utils instead of v8.utils

Hello, 

I found small issue with ruby => java package name mangling.
Here is an example:

``` ruby
Java::ComEclipsesourceV8Utils::V8Executor
NameError: cannot load Java class com.eclipsesource.v8utils.V8Executor
from org/jruby/javasupport/JavaClass.java:204:in `for_name'
```

V8Executor is located inside `com.eclipsesource.v8.utils` package.

Thanks!
