Check-reserved-instances

* support for authenticating via AWS CLI profiles (thanks tabletcorry )

* fixed Elasticache running instances count (thanks chipx86 )

* fixed SMTP multiple recipients (thanks mbassett)
* added unreserved quantity to report (thanks mbassett)

* refactored code to support issue 16 (apply reserved instances and running instances across all configured accounts)
* fixed 18 (with help from jordanjambazov)
* supported feature request 15, you can leave out AWS access key/secret key or configure an IAM role to authenticate across accounts

* merged separating EC2 classiclink and EC2 VPC instances/reservations (6, thanks mbassett )
* fix configuration file not serializing booleans and integers properly (11)

- merged support for ignoring reservations for running instances (thanks marek-knappe)