switch to chef_gem resource

Use the chef_gem resource instead of gem_package, to avoid the contortions required to use & install a gem prior to convergence.
Merge pull request #6 from juliandunn/patch-1

switch to chef_gem resource
release v0.100.2
increment version for development
Add whyrun support to aws providers.
Remove updated_by_last_action() calls since if you're supporting whyrun you don't need to do this yourself.
Merge pull request #8 from opscode-cookbooks/whyrun

Add whyrun support to aws providers.

Tested elastic_ip, ebs_volume with why-run & no-why-run...
making aws_elastic_lb idempotent
add name attribute to metadata
Merge pull request #9 from needle-cookbooks/COOK-1836

COOK-1836: Make aws_elastic_lb idempotent
release v0.100.4
fixes COOK-2148, attach action correctly saves volume_id
Merge pull request #10 from sgerstein/master

Fix for COOK-2148
add comment that vol from determine_volume is a hash
release v0.100.6