Feature/update instance types

Updates the `instance.rb#TYPES` to the latest known options provided by EY

```
small                 Standard Small
medium_ram            Standard Medium
medium_cpu            High-CPU Medium
c3_large              C3 Large
large                 Standard Large
c3_xlarge             C3 Extra Large
xlarge_ram            High Memory Extra Large
xlarge                Standard Extra Large
xlarge_cpu            High-CPU Extra Large
c3_2xlarge            C3 Double Extra Large
doublexlarge_ram      High-Memory Double Extra Large
c3_4xlarge            C3 Quadruple Extra Large
quadxlarge_ram        High-Memory Quadruple Extra Large
c3_8xlarge            C3 Eight Extra Large
quadxlarge_io         High I/O Quadruple Extra Large
m3_medium             M3 Medium
m3_large              M3 Large
m3_xlarge             M3 Extra Large
m3_2xlarge            M3 Double Extra Large
```