v0.20 /~https://github.com/zordius/lightncandy/tree/v0.20
- align with handlebars.js 3.0.0
- 3d9a557 fix
{{foo (bar ../abc)}} compile bug
- 7dc16ac refine custom helper error detection logic
- 72d32dc fix subexpression parsing bug inside
{{#each}}
- d1f1b93 support context access inside a hbhelper by
$options['_this']
