Implemented issue #190 for dbpedia warmup task

Code for warmup task #190.
I implemented a script to extract all the images from a wikipedia article.
The script expects a single command line argument in the form ```lang:article```, for instance ```en:Queen_(band)``` and prints all the triples on standard output.
```
../run JsonpediaImageExtractor "en:Queen_(band)"
...
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Queen_II.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:QueenPerforming1978.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Queen_12041982_01_800b.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Queen_1984_012.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Freddie_Bronzestatue_rueckansicht.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Queen_star_walk_of_fame.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:2005_Queen_+_Paul_Rodgers.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:Brianrs.jpg> .
<http://dbpedia.org/resource/Queen_(band)> <http://xmlns.com/foaf/0.1/depiction> <http://en.wikipedia.org/wiki/File:WeWillRockYouDominion.jpg> .
...
```
Does  have any suggestions to make this better ?
Thanks,
Rob