Start making create script idempotent

scripts/create_tables.sql

@@ -1,10 +1,14 @@
 BEGIN TRANSACTION;
-CREATE TABLE Author(
+DROP TABLE IF EXISTS "author";
+DROP TABLE IF EXISTS "quote";
+DROP TABLE IF EXISTS "category";
+DROP TABLE IF EXISTS "quotecategory";
+CREATE TABLE author(
     aid SERIAL PRIMARY KEY,
     fname TEXT,
     lname TEXT
 );
-CREATE TABLE Quote(
+CREATE TABLE quote(
     qid SERIAL PRIMARY KEY,
     qtext TEXT,
     aid INTEGER,
@@ -12,11 +16,11 @@ CREATE TABLE Quote(
     qdate DATE,
     FOREIGN KEY (aid) REFERENCES Author(aid)
 );
-CREATE TABLE Category(
+CREATE TABLE category(
     cid SERIAL PRIMARY KEY,
     description TEXT
 );
-CREATE TABLE QuoteCategory(
+CREATE TABLE quotecategory(
     qid INTEGER,
     cid INTEGER,
     FOREIGN KEY(qid) REFERENCES Quote(qid),