adding kitchensink example

[skip ci]
router: move from translate_extensions plug

add additional routes for file extensions of supported response types.
fix typo with accept header.
start v0.1.1-dev.
router: need a better way to match extensions on requests

for #6. corrects original issue, but breaks a feature
adding notes to readme for new features

[skip ci]
Merge branch 'master' of github.com:slogsdon/placid