Update version to 4.1.0

Merge pull request #48 from mudbugmedia/add-manifest-path-exception

Add exception to prevent invalid configuration

Merge pull request #47 from mudbugmedia/update-penthouse-2-2-0

Update penthouse to 2.2.0

Merge pull request #43 from mudbugmedia/fix-no-route-error

Don’t raise a hard error if a route is not present.

Remove gem build warnings

Merge pull request #40 from mudbugmedia/update-penthouse

Update penthouse

Merge pull request #39 from mudbugmedia/fix-css-paths

Fix css paths

Merge pull request #34 from mudbugmedia/refactors

Refactors

Update penthouse to 1.10.1

Merge pull request #29 from mudbugmedia/update-penthouse-1-6-0

Update Penthouse to 1.6.0