fix: break/continue omitting output before them, #123

BREAKING CHANGE: remove default export, now should be used like import
{Liquid} from 'liquidjs'

src/util/assert.ts

@@ -1,6 +1,6 @@
 import { AssertionError } from './error'
 
-export default function<T> (predicate: T | null | undefined, message?: string) {
+export function assert <T> (predicate: T | null | undefined, message?: string) {
   if (!predicate) {
     message = message || `expect ${predicate} to be true`
     throw new AssertionError(message)

src/util/error.ts

@@ -1,6 +1,6 @@
 import * as _ from './underscore'
-import Token from '../parser/token'
-import ITemplate from '../template/itemplate'
+import { Token } from '../parser/token'
+import { ITemplate } from '../template/itemplate'
 
 abstract class LiquidError extends Error {
   private token: Token