Fix/jna import

OSGi unit was looking for JNA 0.1.5 in maven central
https://travis-ci.org/irstv/orbisgis/jobs/24976747
```
Running org.orbisgis.itest.BundleTest
47 [main] INFO org.ops4j.pax.exam.spi.DefaultExamSystem - Pax Exam System (Version: 3.3.0) created.
172 [main] INFO org.ops4j.pax.exam.junit.impl.ProbeRunner - creating PaxExam runner for class org.orbisgis.itest.BundleTest
257 [main] INFO org.ops4j.pax.exam.junit.impl.ProbeRunner - running test class org.orbisgis.itest.BundleTest
4033 [main] WARN org.ops4j.pax.url.mvn.internal.AetherBasedResolver - Error resolving artifactorg.orbisgis:java-network-analyzer:jar:0.1.5:Could not find artifact org.orbisgis:java-network-analyzer:jar:0.1.5 in central (http://repo1.maven.org/maven2/)
org.sonatype.aether.resolution.ArtifactResolutionException: Could not find artifact org.orbisgis:java-network-analyzer:jar:0.1.5 in central (http://repo1.maven.org/maven2/)
at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:538)
```