add getBigDecimal and getBitInteger methods.

Author: webee

README.md

@@ -15,6 +15,6 @@ To install the library add:
         maven { url "https://jitpack.io" }
    }
    dependencies {
-         compile 'com.github.webee:java-json-api:v1.3.1'
+         compile 'com.github.webee:java-json-api:v1.4.0'
    }
    ```

src/main/java/com/github/webee/json/JSONArray.java

@@ -1,5 +1,8 @@
 package com.github.webee.json;
 
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
 /**
  * Created by webee on 16/11/25.
  */
@@ -12,9 +15,11 @@ public interface JSONArray {
     Object[] get();
     Object get(int index);
     Boolean getBoolean(int index);
+    BigDecimal getBigDecimal(int index);
+    BigInteger getBigInteger(int index);
+    Double getDouble(int index);
     Integer getInteger(int index);
     Long getLong(int index);
-    Double getDouble(int index);
     String getString(int index);
     JSONArray getArray(int index);
     JSONObject getObject(int index);

src/main/java/com/github/webee/json/JSONObject.java

@@ -1,5 +1,7 @@
 package com.github.webee.json;
 
+import java.math.BigDecimal;
+import java.math.BigInteger;
 import java.util.Map;
 import java.util.Set;
 
@@ -16,9 +18,11 @@ public interface JSONObject {
     Map<String, Object> get();
     Object get(String key);
     Boolean getBoolean(String key);
+    BigDecimal getBigDecimal(String key);
+    BigInteger getBigInteger(String key);
+    Double getDouble(String key);
     Integer getInteger(String key);
     Long getLong(String key);
-    Double getDouble(String key);
     String getString(String key);
     JSONArray getArray(String key);
     JSONObject getObject(String key);