Ensure compatibility with Grape 0.8.0, 0.9.0 and 0.9.1.
Merge pull request #170 from dblock/grape-0.9.1

Ensure compatibility with Grape 0.8.0, 0.9.0 and 0.9.1.
Fix problem with using prefix name somewhere in api paths
Merge pull request #172 from grzesiek/doc-fix

Fix problem with using prefix name somewhere in api paths
Update README.md
Merge pull request #175 from mikefischer/master

Update README.md
Added ability to load nested models recursively.
Fixed problem with Virtus::Attribute::Boolean