#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/test/java/fr/xephi/authme/security/crypts/Pbkdf2DjangoTest.java

@@ -0,0 +1,16 @@
+package fr.xephi.authme.security.crypts;
+
+/**
+ * Test for {@link Pbkdf2Django}.
+ */
+public class Pbkdf2DjangoTest extends AbstractEncryptionMethodTest {
+
+    public Pbkdf2DjangoTest() {
+        super(new Pbkdf2Django(),
+            "pbkdf2_sha256$15000$50a7ff2d7e00$t7Qx2CfzMhGEbyCa3Wk5nJvNjj3N+FdxhpwJDerl4Fs=",  // password
+            "pbkdf2_sha256$15000$f9d8a58f3fe2$oMqmMGuJetdubW0cpubmT8CltQLjHT+L2GuwKsaWLx8=",  // PassWord1
+            "pbkdf2_sha256$15000$1170bc7a31f5$Ex/2aQsXm4kogLIYARpUPn04ccK5LYYjyVPpl32ALjE=",  // &^%te$t?Pw@_
+            "pbkdf2_sha256$15000$c029bd67eea4$Hfw992SL2WtYQ6g2WLdxA09hbmMDwjrr/Z+uUggbxwo="); // âË_3(íù*
+    }
+
+}