update to Handlebars 1.0.0-rc.4

## v1.0.11 / 1.0.0-rc4 - May 13 2013

- [#458](https://github.com/wycats/handlebars.js/issues/458) - Fix `./foo` syntax ([@jpfiset](https://github.com/jpfiset))
- [#460](https://github.com/wycats/handlebars.js/issues/460) - Allow `:` in unescaped identifers ([@jpfiset](https://github.com/jpfiset))
- [#471](https://github.com/wycats/handlebars.js/issues/471) - Create release notes (These!)
- [#456](https://github.com/wycats/handlebars.js/issues/456) - Allow escaping of `\\`
- [#211](https://github.com/wycats/handlebars.js/issues/211) - Fix exception in `escapeExpression`
- [#375](https://github.com/wycats/handlebars.js/issues/375) - Escape unicode newlines
- [#461](https://github.com/wycats/handlebars.js/issues/461) - Do not fail when compiling `""`
- [#302](https://github.com/wycats/handlebars.js/issues/302) - Fix sanity check in knownHelpersOnly mode
- [#369](https://github.com/wycats/handlebars.js/issues/369) - Allow registration of multiple helpers and partial by passing definition object
- Add bower package declaration ([@DevinClark](https://github.com/DevinClark))
- Add NuSpec package declaration ([@MikeMayer](https://github.com/MikeMayer))
- Handle empty context in `with` ([@thejohnfreeman](https://github.com/thejohnfreeman))
- Support custom template extensions in CLI ([@matteoagosti](https://github.com/matteoagosti))
- Fix Rhino support ([@broady](https://github.com/broady))
- Include contexts in string mode ([@leshill](https://github.com/leshill))
- Return precompiled scripts when compiling to AMD ([@JamesMaroney](https://github.com/JamesMaroney))
- Docs updates ([@iangreenleaf](https://github.com/iangreenleaf), [@gilesbowkett](https://github.com/gilesbowkett), [@utkarsh2012](https://github.com/utkarsh2012))
- Fix `toString` handling under IE and browserify ([@tommydudebreaux](https://github.com/tommydudebreaux))
- Add program metadata

[Commits](https://github.com/wycats/handlebars.js/compare/v1.0.10...master)