Add support for standard bower package format.

Closes #35.
Merge pull request #41 from kenips/master

Add support for standard bower package format.
add to changelog info about #41
Use root .bowerrc as starting point, rather than creating one from scratch.

Remove uneeded method.
Merge pull request #40 from 3martini/merge-dot-bowerrc

Use root .bowerrc as starting point, rather than creating one from scratch
Use Dir.pwd as a root path without depending on Rails.root. Fixes #42
Merge branch 'master' of github.com:42dev/bower-rails
update changelog
fix 'only generation of JSON objects or arrays' allowed error
allow to store assets only in :lib or :vendor dir
keep groups independent for DSL
Assign default or custom assets_path for a group if it is not provided
more specs
A better check for bower.json formats.
Merge pull request #45 from kenips/lib_only_install

A better check for bower.json formats.
Added task to resolve relative URLs in CSS files with Rails asset_path helper.
Install and resolve bower components before precompile.
Fix .travis.yml: remove rails 3.0 and rubinius
Merge pull request #49 from jimpo/master

Fix relative URLs in bower components
Merge branch 'master' of github.com:42dev/bower-rails