[REFACTORING]Use dot accessor instead of hash accessor for auth parameters
WIP: add developer strategy of OmniAuth
Change fields for developer strategy: name -> nickname, add uid
Add links to sign in at development environment
[BUG FIX]:github -> "github"
Change spec after implementation
Dev sign in -> Sign in as a developer
Add spec for developer strategy of OmniAuth
Sign in as a developer -> Sign in with developer strategy

"Sign in as a developer" sounds like
"Sign in as a developer who has additional privilegeds."
Fix spec following change of implementation
Test all about Signin/Signout for development environment
Gather routes for dev environment at the same place
Manage OAuth providers in config file
Remove unneccessary #try
Resolve conflict
Merge pull request #41 from KitaitiMakoto/omniauth-developer

Omniauth developer strategy
More Rails4-ish way.
Merge pull request #49 from kentaro/use_add_flash_types

Use `add_flash_types`, more Rails4-ish way.
`bundle update`
pull-reqテスト用のコミット