added admin notice

Added admin notice for affiliate_added_failed, affiliate_active and
affiliate_inactive. Also make sure that they are displayed.
redirect with admin notice

after an action is performed redirection is made with the admin notice
fine tuned add_query_arg

There is no need to add affwp_notice to the url when adding args to the
url.
added verification checks to calls
modified $_REQUEST
added textdomain and more admin notice
modified admin notice when an affiliate is rejected
fix for affwp_get_affiliate_email
fixed variable name that was misspelt
fine tuned getting user_id
display affiliate rate when viewing affiliates
fixed merge conflicts
Merge remote-tracking branch 'upstream/master'

Conflicts:
	includes/admin/class-notices.php
	includes/affiliate-functions.php
Fixed merge conflict
Fix incorrect affiliates page URL
Fixed merge conflicts
Fixed merge conflict
Fixed merge conflict
Fixed merge conflict
Merge remote-tracking branch 'upstream/master'