Merge branch 'Issue372' into develop

...resources/assets/org/orekit/rugged/RuggedMessages_fr.utf8

...resources/assets/org/orekit/rugged/RuggedMessages_gl.utf8

...resources/assets/org/orekit/rugged/RuggedMessages_it.utf8

...resources/assets/org/orekit/rugged/RuggedMessages_no.utf8

...resources/assets/org/orekit/rugged/RuggedMessages_ro.utf8

src/site/markdown/building.md

src/site/markdown/guidelines.md

src/test/java/org/orekit/rugged/api/RuggedBuilderTest.java

src/test/java/org/orekit/rugged/api/RuggedTest.java

...est/java/org/orekit/rugged/errors/RuggedMessagesTest.java

...java/org/orekit/rugged/raster/RandomLandscapeUpdater.java

...g/orekit/rugged/refraction/AtmosphericRefractionTest.java

src/test/java/org/orekit/rugged/utils/GeodeticUtilities.java