Update README.md
Fixed authentication bug.
Update README.md
Fixed empty firstname and lastname

Without this fix firstname and lastname are getting filled only after
user logs out and logs in again. Themes that welcome user like "Hello
Dmitry …" get confused and say just "Hello …"
add more information about the location of potential login php script
Respect the "prevent account creation" option from Moodle. Throw a new type of error to indicate that the user cannot create accounts simply by logging in.

Other: Condense logic in user_login() function.

Conflicts:

	auth.php
Merge branch 'master' of https://github.com/mouneyrac/auth_googleoauth2
More information about the plugin
Merge pull request #16 from dmatora/matora-fix

Fixed empty firstname and lastname
Update README.md
fix the url markdowns
Fix code example: issue when seeing other oauth2 provider
#21 Need links on the admin page to know where to go to find keys/secrets
#21 add more detailled instructions for setting up Google/Facebook/WindowsLive
#21 Clean README.md from some installation instructions moved into the admin setting page.
#19 more README.md cleaning.
#21 fix javascript origin for Google
Merge branch 'master' of https://github.com/mouneyrac/auth_googleoauth2
#21 fix windows live url
#21 Add information about infodb setting.