Added user badges and "member since"

added ProBadge, InvestorBadge, DonorBadge components, css
removed "PRO" from appending in display_name
fixes: #50

app/serializers/rest/account_serializer.rb

@@ -5,7 +5,7 @@ class REST::AccountSerializer < ActiveModel::Serializer
 
   attributes :id, :username, :acct, :display_name, :locked, :bot, :created_at,
              :note, :url, :avatar, :avatar_static, :header, :header_static,
-             :followers_count, :following_count, :statuses_count, :is_pro, :is_verified
+             :followers_count, :following_count, :statuses_count, :is_pro, :is_verified, :is_donor, :is_investor
 
   has_one :moved_to_account, key: :moved, serializer: REST::AccountSerializer, if: :moved_and_not_nested?
   has_many :emojis, serializer: REST::CustomEmojiSerializer