-Added overloaded constructor for StripeResponse to pass HTTP response headers
-Updated contant name so it is uppercase: prettyPrintGson -> PRETTY_PRINT_GSON / gson -> GSON
-Added more readable timeout values 30000 -> 30 * 1000 / 80000 -> 80 * 1000
-Removed trailing comments (per Steve McConnel in "Code Complete")
-Replaced StringBuffer with StringBuilder
-instance variable should be generic Map type
-Per Josh Block on Design Copy Constructor should be used over clone (StripeTest)
-Refactored createQuery so it doesn't have to call queryStringBuffer.deleteCharAt(0);