drop oauth2 feature support

conf/app.ini

@@ -139,44 +139,6 @@ FROM =
 USER =
 PASSWD =
 
-[oauth]
-ENABLED = false
-
-[oauth.github]
-ENABLED = false
-CLIENT_ID =
-CLIENT_SECRET =
-SCOPES = https://api.github.com/user
-AUTH_URL = https://github.com/login/oauth/authorize
-TOKEN_URL = https://github.com/login/oauth/access_token
-
-; Get client id and secret from
-; https://console.developers.google.com/project
-[oauth.google]
-ENABLED = false
-CLIENT_ID =
-CLIENT_SECRET =
-SCOPES = https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile
-AUTH_URL = https://accounts.google.com/o/oauth2/auth
-TOKEN_URL = https://accounts.google.com/o/oauth2/token
-
-[oauth.qq]
-ENABLED = false
-CLIENT_ID =
-CLIENT_SECRET =
-SCOPES = get_user_info
-; QQ 互联
-AUTH_URL = https://graph.qq.com/oauth2.0/authorize
-TOKEN_URL = https://graph.qq.com/oauth2.0/token
-
-[oauth.weibo]
-ENABLED = false
-CLIENT_ID =
-CLIENT_SECRET =
-SCOPES = all
-AUTH_URL = https://api.weibo.com/oauth2/authorize
-TOKEN_URL = https://api.weibo.com/oauth2/access_token
-
 [cache]
 ; Either "memory", "redis", or "memcache", default is "memory"
 ADAPTER = memory

conf/locale/locale_en-US.ini

@@ -5,7 +5,6 @@ dashboard = Dashboard
 explore = Explore
 help = Help
 sign_in = Sign In
-social_sign_in = Social Sign In: 2nd Step <small>associate account</small>
 sign_out = Sign Out
 sign_up = Sign Up
 register = Register