First approach to social connect (Facebook only)
Added top button
Merge branch 'icy_phoenix.git/master'
Merge branch 'origin/master'

Conflicts:
	includes/usercp_register.php
Social connect bugfixes
Merge branch 'MG/master'

Conflicts:
	includes/usercp_register.php
Bugs
Merge pull request #44 from GabrielAnca/social_connect

Social connect
Quite important commit... both Social Networks Connection (Facebook first...) and removed two main features from core files (Links and Sudoku) which have been moved to plugin.
Social Connection: thanks to KasLimon
Links And Sudoku; thanks to InformPro
Few bugs fixed as well
Moved some ACP modules, emptied robot.txt (there was a lot of old mess)