Add setQuery and setSearch methods

urijs/URI-tests.ts

@@ -26,4 +26,9 @@ new URI({
     fragment: 'frag'
 });
 
+URI('').setQuery('foo', 'bar');
+URI('').setQuery({ foo: 'bar' });
+URI('').setSearch('foo', 'bar');
+URI('').setSearch({ foo: 'bar' });
+
 var uri: uri.URI = $('a').uri();

urijs/URI.d.ts

@@ -97,6 +97,10 @@ declare module uri {
         segment(position: number): string;
         segment(position: number, level: string): string;
         segment(level: string): string;
+        setQuery(key: string, value: string): URI;
+        setQuery(qry: Object): URI;
+        setSearch(key: string, value: string): URI;
+        setSearch(qry: Object): URI;
         subdomain(): string;
         subdomain(subdomain: string): URI;
         suffix(): string;