Update native-lib-loader to 2.0.1 release

This version has been [deployed to OSS Sonatype](http://oss.sonatype.org/content/repositories/releases/org/scijava/native-lib-loader/2.0.1/), and is hence available on Maven Central. It is also a release version, which is very important since snapshot version couplings can cause dependencies to change "out from under" a component, resulting in irreproducible builds. Especially for releases, we do not want any snapshot dependency couplings (the most recent Bio-Formats 5.0.1 release POM still somehow declares a dependency on native-lib-loader 2.0-SNAPSHOT).