Merge pull request #158 from ihavenoface5/issue-157

path sent to unlink is now checked for file prefix.

Author: Traviskn

android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java

@@ -490,7 +490,8 @@ static void closeStream(String streamId, Callback callback) {
      */
     static void unlink(String path, Callback callback) {
         try {
-            RNFetchBlobFS.deleteRecursive(new File(path));
+            String normalizedPath = normalizePath(path);
+            RNFetchBlobFS.deleteRecursive(new File(normalizedPath));
             callback.invoke(null, true);
         } catch(Exception err) {
             callback.invoke(err.getLocalizedMessage(), false);