added tests for new I2 instances
updated dependency on new asw-sdk and added new I2 type
updated JSON to include new I2 types
[ASGARD-1271] Add support for c3, i2, new m3 instance types finished
added 120 line break
updated per pull request reviews - importantly, AutoScalingControllerSpec preserves ordering of instance type pricing
Fixed line length
updated changes doc
Merge pull request #474 from aglover/instance-types

Adds support for new AWS Instance types and provides Asgard with room to easily add more w/o need to upgrade AWS lib