Task 1090 renamed to PgSaurus

[Task 1090] (https://integracredit.acunote.com/projects/44826/tasks/1090) - Rename PgPower to PgSaurus

### Changes
* Renamed to PgSaurus

### RSpec
```
Finished in 0.5921 seconds (files took 1.58 seconds to load)
155 examples, 0 failures, 2 pending
```

### Docs
```
Files:          43
Modules:        40 (    0 undocumented)
Classes:         7 (    0 undocumented)
Constants:       8 (    0 undocumented)
Methods:       151 (    0 undocumented)
 100.00% documented
```