Upgrade handlebars to the 1.1.2 release

The release includes 6 months worth of improvements and bug fixes, some
of them fairly critical.
Merge pull request #88 from sorentwo/upgrade-handlebars

Upgrade handlebars to the 1.1.2 release
Fix dependencies on MultiJson
Release version 0.15
Suggestion by @jithugopal Issue #90, to note about template namespace object existence.
Update handlebars to v1.3.0
Merge pull request #92 from neodude/update-handlebars

Update handlebars to v1.3.0
Update version to 0.16
Merge pull request #98 from Chetane/update-version

Update version to 0.16
Fix typo in README
Merge pull request #99 from Chetane/update-version

Fix typo in CHANGELOG
fixes regex matching template names
adds handling .hbs.erb (or other extensions) files
Merge pull request #101 from langalex/regex_bugfix

fixes regex matching template names
Merge pull request #102 from langalex/erb_templates

Erb templates
step 1, refactor
change how sprocket registers, we need an engine
Massive cleanup, chomp trailing newline.
remove automatic registration of extensions, temporarily.
cleanup configuration, and add extension configuration