Merge pull request #92 from timsuchanek/0.10.0

Added SDCard for Android

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

         res.put("DownloadDir", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath());
         res.put("MovieDir", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getAbsolutePath());
         res.put("RingtoneDir", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_RINGTONES).getAbsolutePath());
+        res.put("SDCard", Environment.getExternalStorageDirectory().getAbsolutePath());
         return res;
     }
 

src/fs.js

     MusicDir : RNFetchBlob.MusicDir,
     MovieDir : RNFetchBlob.MovieDir,
     DownloadDir : RNFetchBlob.DownloadDir,
-    DCIMDir : RNFetchBlob.DCIMDir
+    DCIMDir : RNFetchBlob.DCIMDir,
+    SDCardDir : RNFetchBlob.SDCardDir
 }
 
 /**