Began work on real sql schema definitions, and migration engine

pkg/services/sqlstore/migrations/builder.go

@@ -0,0 +1,31 @@
+package migrations
+
+type migration struct {
+	desc        string
+	sqlite      string
+	verifyTable string
+}
+
+type migrationBuilder struct {
+	migration *migration
+}
+
+func (b *migrationBuilder) sqlite(sql string) *migrationBuilder {
+	b.migration.sqlite = sql
+	return b
+}
+
+func (b *migrationBuilder) verifyTable(name string) *migrationBuilder {
+	b.migration.verifyTable = name
+	return b
+}
+
+func (b *migrationBuilder) add() *migrationBuilder {
+	migrationList = append(migrationList, b.migration)
+	return b
+}
+
+func (b *migrationBuilder) desc(desc string) *migrationBuilder {
+	b.migration = &migration{desc: desc}
+	return b
+}