Add optional lang property on AbstractAdapter

Usage: Set field 'lang' in constructor array $param.
Default value: 'en'
Add getPhone(), getCountry(), getCity() methods on AbstractAdapter
Add phone, country, city fields on Vk adapter
Bug fix: ability to change language
Add get country, city fields on Mailru adapter
Bug fix: getting firstname and lastname on Mailru adapter
Add autoload function
Merge branch 'master' of github.com:mervick/SocialAuther

Conflicts:
	src/SocialAuther/Adapter/AbstractAdapter.php