Injector progressbar

This is a continuation of #4. 

injectfault.py now prints an ASCII progress bar with the percent complete, current run number, and total number of runs. Sample output:
```
======Fault Injection======
---FI Config #0---
[===========>---------------------------------------] 23.1% (3 / 13)
```
If "verbose" is specified in that run's configuration (within the input YAML file), then a summary of return codes is also printed.