update readme
add Portuguese translations (thanks @Skizito)
update social authentication (google openid to google oauth)
update generateRandomKey() to generateRandomString() (fix #31)
update social readme
update to 2.1.0-alpha4
Adding translations to Ukrainian and Russian languages
Merge pull request #32 from astappev/master

Adding translations to Ukrainian and Russian languages
Merge remote-tracking branch 'upstream/master'