Add welcome page
Add settings link and getting started link

Added the settings links and getting started link when viewing the
plugin details.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	affiliate-wp.php
fixed merge conflict
fixed merge conflict
Merge branch 'master' of github.com:tubiz/AffiliateWP into tubiz-master
Rename to class-welcome.php and rename to Affiliate_WP_Welcome
Add welcome class file