Merge pull request #84 from soitgoes/master

Fix bug where content-type doesn't exists ($.ajax was failing)
bump to v0.5.15
update encryptionKey to secret in bogart.session and CookieDataProvider
make batteries require a secret
improve invalid response object error message
Merge pull request #88 from weskinner/master

improve invalid response object error message
add session#destroy method to remove a session
bump to v0.5.16
Last parameter replacement pattern
Merge branch 'master' of github.com:nrstott/bogart
move facebook profile parsing logic to parseFacebookProfile function
fix reference error in parseFacebookProfile. Change the emails array to being simple email strings instead of objects
add facebook specs
update facebook middleware and example, fix error of returning router without nextApp passed in oauth2 middleware
change encryptionKey to secret in SessionIdProvider. Encrypt the cookie name in SessionIdProvider
fix error in passing cookieKey to helper functions in SessionIdProvider
Bump to v0.5.17
add spec/ and _site/ to npmignore
add twitter authentication
refactor google authentication