Suggestion for Issue 48: Avoid hard-coding values within attack scripts through parameterization

Hello Mani,

My first pull request -- please bear with me.

Corresponds to: 
https://github.com/gauntlt/gauntlt/issues/48

Wiki page how-to that can be added to gauntlt wiki:
https://github.com/boldersecurity/gauntlt/wiki/Using-Cucumber-Profiles-and-Environment-Variables-with-Gauntlt


I'm not sure if the commit "76c8f53" will do anything -- I couldn't remove that particular commit from this pull request. 

The only relevant commit is "93d134e"