Update AWScloudwatchElasticache.rb

Catch special case where Dimension list is empty for a metric
Merge pull request #7 from sittercity/master

Update AWScloudwatchElasticache.rb  Thank you!
update twitter.rb to use v1.1 api as v1 is deprecated, add to config.rb-sample, uniform example spacing
update README.md for twitter changes
rename twitter.rb to twitter_followers.rb
renamed twitter.rb, added CW usage/cost note, added CW/Fog bug note, added two TODOs
added tag reporting if specified in config.rb
add tag reporting options for AWS tags, add retry and timeouts for AWS CW and Graphite
add timeout and retry to Graphite
add EC2 instance CW metric collection
add AWScloudwatchEC2.rb to README, update AWScountEC2.rb
Merge pull request #8 from drewrothstein/master

added tag reporting, instance metrics script, retries/timeout (limited) and twitter followers fix