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 conflict
Fixes a resulting 404 error when affiliates try to filter their Referrals Over Time
fix "successfull" typo in api_request() comment block
fix "referal" typo in getting_started_screen()
Neglected to update the <select> name to the proper variable as well
Refer to records as 'affiliate records' instead of 'license keys'
add admin styles and wrap dashboard widgets
restructure CSS edits
Fixed merge conflicts