added os version recognition for libraries

src/main/java/amidst/mojangapi/file/LibraryFinder.java

@@ -38,7 +38,7 @@ public enum LibraryFinder {
 
 	private static File getLibraryFile(File librariesDirectory, LibraryJson library) {
 		try {
-			if (library.isActive(getOs())) {
+			if (library.isActive(getOs(), OperatingSystemDetector.getVersion())) {
 				return getLibraryFile(getLibrarySearchPath(librariesDirectory, library.getName()));
 			} else {
 				return null;

src/main/java/amidst/mojangapi/file/json/version/LibraryJson.java

@@ -24,13 +24,13 @@ public class LibraryJson {
 	 * applicable rule. However, this might be wrong so we need to take the most
 	 * specific rule? For now this works fine.
 	 */
-	public boolean isActive(String os) {
+	public boolean isActive(String os, String version) {
 		if (rules.isEmpty()) {
 			return true;
 		}
 		boolean result = false;
 		for (LibraryRuleJson rule : rules) {
-			if (rule.isApplicable(os)) {
+			if (rule.isApplicable(os, version)) {
 				result = rule.isAllowed();
 			}
 		}

src/main/java/amidst/mojangapi/file/json/version/LibraryRuleJson.java

@@ -14,8 +14,8 @@ public class LibraryRuleJson {
 	public LibraryRuleJson() {
 	}
 
-	public boolean isApplicable(String os) {
-		return this.os == null || this.os.getName().equals(os);
+	public boolean isApplicable(String os, String version) {
+		return this.os == null || this.os.isApplicable(os, version);
 	}
 
 	public boolean isAllowed() {

src/main/java/amidst/mojangapi/file/json/version/LibraryRuleOsJson.java

@@ -1,17 +1,20 @@
 package amidst.mojangapi.file.json.version;
 
+import java.util.regex.Pattern;
+
 import amidst.documentation.GsonConstructor;
 import amidst.documentation.Immutable;
 
 @Immutable
 public class LibraryRuleOsJson {
 	private volatile String name;
+	private volatile String version;
 
 	@GsonConstructor
 	public LibraryRuleOsJson() {
 	}
 
-	public String getName() {
-		return name;
+	public boolean isApplicable(String os, String version) {
+		return this.name.equals(os) && (this.version == null || Pattern.matches(this.version, version));
 	}
 }

src/main/java/amidst/util/OperatingSystemDetector.java

@@ -7,6 +7,7 @@ public enum OperatingSystemDetector {
 	;
 
 	private static String OS_NAME = System.getProperty("os.name").toLowerCase();
+	private static String OS_VERSION = System.getProperty("os.version");
 
 	public static boolean isWindows() {
 		return OS_NAME.indexOf("win") >= 0;
@@ -23,4 +24,8 @@ public enum OperatingSystemDetector {
 	public static boolean isSolaris() {
 		return OS_NAME.indexOf("sunos") >= 0;
 	}
+
+	public static String getVersion() {
+		return OS_VERSION;
+	}
 }