Made Scope.symbol_table public and CodeContext.get_package_path vapi_directories argument nullable

diff --git a/vala/valacodecontext.vala b/vala/valacodecontext.vala
--- a/vala/valacodecontext.vala
+++ b/vala/valacodecontext.vala
@@ -387,7 +387,7 @@ public class Vala.CodeContext : Object {
 		}
 	}
 
-	public string? get_package_path (string pkg, [CCode (array_length_pos = 1.9)] string[] vapi_directories) {
+	public string? get_package_path (string pkg, [CCode (array_length_pos = 1.9)] string[]? vapi_directories) {
 		string basename = "%s.vapi".printf (pkg);
 		string filename = null;
 
diff --git a/vala/valascope.vala b/vala/valascope.vala
--- a/vala/valascope.vala
+++ b/vala/valascope.vala
@@ -37,7 +37,7 @@ public class Vala.Scope : Object {
 	 */
 	public weak Scope parent_scope { get; set; }
 
-	private Map<string,Symbol> symbol_table;
+	public Map<string,Symbol> symbol_table;
 	private Gee.List<Symbol> anonymous_members;
 
 	/**