Tell DictionariesNameFinder to recognize more than one occurrences

I think the code [here](https://github.com/ixa-ehu/ixa-pipe-nerc/blob/8b654980d3b9f9373247a9f35f82772dce62320f/src/main/java/es/ehu/si/ixa/pipe/nerc/DictionariesNameFinder.java#L153) makes a DictionariesNameFinder recognize only the first occurrence of a name and it is not a desirable behavior. Therefore I created a test and "correct" it. I also added a config file to enable Travis CI as you can see [here](https://travis-ci.org/minhlab/ixa-pipe-nerc/builds/37304196).

If you think it is the case, feel free to pull. Otherwise please forgive me for bothering you.