Merge pull request #10 from chrso/master

started implementing traverse methods; indentation
implemented ifelse_stmt; added more newlines to output .py
hack-y loop_stmt (works); fixed p_loop_stmt in grammar to include for loop brack_stmt
implemented loop_stmt and jump_stmt; passes 0, 1, 2, 3, 5, 8
Merge remote-tracking branch 'upstream/master'