Fix slice method for index 0.

Author: javadev

src/main/java/com/github/underscore/$.java

@@ -1778,7 +1778,7 @@ public List<T> concatWith(final Iterable<T> ... other) {
 
     public static <T> List<T> slice(final Iterable<T> iterable, final int start) {
         final List<T> result;
-        if (start > 0) {
+        if (start >= 0) {
             result = newArrayList(iterable).subList(start, size(iterable));
         } else {
             result = newArrayList(iterable).subList(size(iterable) + start, size(iterable));
@@ -1796,7 +1796,7 @@ public List<T> slice(final int start) {
 
     public static <T> List<T> slice(final Iterable<T> iterable, final int start, final int end) {
         final List<T> result;
-        if (start > 0) {
+        if (start >= 0) {
             if (end > 0) {
                 result = newArrayList(iterable).subList(start, end);
             } else {

src/test/java/com/github/underscore/UnderscoreTest.java

@@ -107,6 +107,7 @@ public void slice() {
         assertEquals(asList(3, 4, 5), $.slice(asList(1, 2, 3, 4, 5), 2));
         assertEquals(asList(3, 4, 5), new $(asList(1, 2, 3, 4, 5)).slice(2));
         assertEquals(asList(2, 3, 4), $.slice(asList(1, 2, 3, 4, 5), 1, 4));
+        assertEquals(asList("a", "b"), $.slice(asList("a", "b", "c", "d"), 0, 2));
         assertEquals(asList(2, 3, 4), $.slice(asList(1, 2, 3, 4, 5), 1, -1));
         assertEquals(asList(3), $.slice(asList(1, 2, 3, 4, 5), 2, 3));
         assertEquals(asList(3), new $(asList(1, 2, 3, 4, 5)).slice(2, 3));