Added Ignore file name option

[kundansdere]

Added Ignore filename option,
ignore_file_name is a repo-level option that, when set to true the file name would be omitted from the prefix.
Usage example :

{
  "version": "1.0",
  "repos" : [{
    "name" : "sample_configuration",
    "url" : "https://github.com/ryanbreen/git2consul_data.git",
    "ignore_file_extension" : true,
    "ignore_file_name" : true,
    "branches" : ["dev"],
    "hooks": [{
      "type" : "polling",
      "interval" : "1"
    }]
  }]
}