removed extra backslash in uri; changed active_support json; added ContactID and ListID to Listrecipient resource
added better error handling
changed active_support parse json times back
took out global parsing of json times; added our own methods to do this
added more comments to resource.rb
added test suite
updated test suite
Merge remote-tracking branch 'upstream/master'
Ignore RubyMine project files
Replaced the "debugger" gem by "byebug"

As I use Ruby 2.1.3 the "debugger" gem don't work anymore and not even installable.