change stripe env variable names

add stripe env variables and initializer

generate new secret key and move to env var file

installing figaro to handle environment variables

add invoice page

add invoice routing

using standard admin factory for client integration test

client permalink is nil by default and cant be solely numbers

set database cleaner to run around each rspec example

client permalink is nil by default and must have characters other than numbers

pulling database_cleaner gem from github repo to fix missing method bug

add page visible to client index view

pending request specs

page_valid is set to false by default

add page visible to client model and corresponding forms / views