code for posting @facebook added
Curl code for posting announcement at facebook added
code added for the first 2 exercise elements
code for coutries targeting added (but post not working)
Merge branch 'exercise3' of http://www.github.com/mkontogiorgis/openeclass into exercise3

Conflicts:
	modules/announcements/index.php
modified code includes all exercise steps solved!
announcement title added to post (link)
1. code for config/config.php & modules/work/index.php added
2. permissions and ownership changed for all /openeclass folder
new comments added for tracing $result variable