#685 Add php implementation for PBKDF2

- Create php sample for PBKDF2
- Rename pbkdf2 java classes (remove Crypt prefix)
- Remove options from hash setting comment that should not be used

src/main/java/fr/xephi/authme/security/crypts/Pbkdf2.java

@@ -7,7 +7,7 @@ import fr.xephi.authme.security.crypts.description.Recommendation;
 import fr.xephi.authme.security.crypts.description.Usage;
 
 @Recommendation(Usage.RECOMMENDED)
-public class CryptPBKDF2 extends HexSaltedMethod {
+public class Pbkdf2 extends HexSaltedMethod {
 
     private static final int NUMBER_OF_ITERATIONS = 10_000;
 

src/main/java/fr/xephi/authme/security/crypts/Pbkdf2Django.java

@@ -9,7 +9,7 @@ import fr.xephi.authme.util.StringUtils;
 import javax.xml.bind.DatatypeConverter;
 
 @AsciiRestricted
-public class CryptPBKDF2Django extends HexSaltedMethod {
+public class Pbkdf2Django extends HexSaltedMethod {
 
     private static final int DEFAULT_ITERATIONS = 24000;
 
@@ -32,7 +32,7 @@ public class CryptPBKDF2Django extends HexSaltedMethod {
         try {
             iterations = Integer.parseInt(line[1]);
         } catch (NumberFormatException e) {
-            ConsoleLogger.warning("Could not read number of rounds for CryptPBKDF2Django:"
+            ConsoleLogger.warning("Could not read number of rounds for Pbkdf2Django:"
                 + StringUtils.formatException(e));
             return false;
         }