Replace version parsing and handling with SemVer4j library

[michaelsembwever]

fyi @ifesdjeen

Two commits:

• first commit puts tests into place
• second commit switches out the impl to use SemVer4j

[michaelsembwever]

(taking this to completion, with the Semver class as part of the API, can be seen in #2 )

[ifesdjeen]

I would create files by hand during tests rather than storing them in repository, maybe something like:

    public static String[] versions = new String[] {
            "2.2.12",
            "2.2.2",
            "3.0.0",
            "3.0.10",
            "3.11.10",
            "3.11.9",
            "4.0-alpha1",
            "4.0-beta1",
            "4.0-rc1",
            "4.0.0",
            "4.1.0"
    };

    @Test
    public void testVersions() throws IOException {
        Path root = Files.createTempDirectory("versions");

        for (String version : versions) {
            Files.createFile(Paths.get(root.toAbsolutePath().toString(),
                    "dtest-" + version + ".jar"));
        }

        Versions versions = Versions.find(root.toAbsolutePath().toString());
    }

+1 otherwise

[michaelsembwever]

I would create files by hand during tests rather than storing them in repository, maybe something like:

yeah, bang on good idea, will do…

EDIT: done.