Remove unused methods (#30)

Remove unused methods

src/API/IFileAccess.vala

@@ -44,8 +44,6 @@ namespace Taxi {
 
         public abstract void open_file (Soup.URI uri);
 
-        public abstract void edit_file (Soup.URI uri);
-
         public abstract File get_current_file ();
     }
 }

src/API/IFileOperations.vala

@@ -35,7 +35,5 @@ namespace Taxi {
             FileCopyFlags flags = FileCopyFlags.NONE,
             Cancellable? cancellable = null
         ) throws Error;
-
-        public async abstract bool rename_file (File file, string new_name) throws Error;
     }
 }

src/Backend/FileAccess.vala

@@ -57,9 +57,6 @@ namespace Taxi {
             }
         }
 
-        public virtual void edit_file (Soup.URI uri) {
-        }
-
         public virtual File get_current_file () {
             return file_handle;
         }

src/Backend/FileOperations.vala

@@ -148,9 +148,5 @@ namespace Taxi {
                 warning ("Unrecognised file type" + file_type.to_string ());
             }
         }
-
-        public async bool rename_file (File file, string new_name) throws Error {
-            return false;
-        }
     }
 }