Merge pull request #2 from mookie-/master

Update README
add #id method to instance.
add instance id to the list command.
add command line options --elba and --with_instance_ids
don't actually want a new line forced into the output.
Merge pull request #2 from HouseTrip/list_instance_ids

List instance ids
use nested modules to prevent undefined module errors in ruby 2.0
add a .travis.yml file.
add a default rake task
add an assertion to a test that could potentially return a false positive.
add an assertion to a test that could potentially return a false positive.
fill in pending spec for creating server tags
remove the shared example.. doesn't make sense
dns update should occur
add an assertion to the test..
improve test for when a server does not exist.
remove commented out before block.
don't rely on .blank?
Merge pull request #3 from HouseTrip/fix_test_suite

Fix test suite
Makes the list command more agnostic