CDK-619: Implemented read/write support for Pig

     * The patch still needs to move the pig dependencies under
       dependency management in the parent pom.
     * This needs more tests, in particular on error handling.
This assumes that there is a ":" in the String. You might consider doing something similar to the [`URIPattern`](https://github.com/kite-sdk/kite/blob/master/kite-data/kite-data-core/src/main/java/org/kitesdk/data/spi/URIPattern.java#L337) code to avoid `IndexOutOfBoundsException`.