added a 1st pass at a contributing doc
updates to document based upon team feedback. V2, baby
added bullets
added link to who is using asgard
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 per Tomas request
Merge branch 'contributing-doc' of github.com:aglover/asgard into contributing-doc
ASGARD-1066-APP-GROUPS group applications by app group & add support for tags
tuning code style for codenarc
appeasing the codenarc again
updates from code review

> Adding JavaDoc to GroupedAppRegistrationSet
> renaming "parseTags" to "normalizeTagDelimiter" in ApplicationController
Changed the order of methodologies for getting AWS credentials, to make it easier for Asgard developers to migrate gradually from SSH remote creds to key management service SSL remote creds, while enabling both in the developer configuration settings
Merge pull request #480 from joesondow/try-key-management-creds-after-ssh-creds

Changed the order of methodologies for getting AWS credentials
Merge pull request #477 from danveloper/ASGARD-1066-APP-GROUPS

ASGARD-1066 group applications by app group & add support for tags