Setting tags for skipping and selecting task

[IvashchenkoSerhii]

Implemented tags #81

list-tags

drill --benchmark example/benchmark.yml --list-tags

Tags            ["tag_user"]

list-tasks & tags

drill --benchmark example/benchmark.yml --list-tasks --tags tag_user

Tags            ["tag_user"]
---
name: Tagged user request
request:
  url: /api/users/70
tags:
  - tag_user

list-tasks & skip-tags

drill --benchmark example/benchmark.yml --list-tasks --skip-tags tag_user

Skip-Tags       ["tag_user"]
---
name: Include comments
include: comments.yml
---
name: Fetch users
request:
  url: /api/users.json
---
name: Fetch organizations
request:
  url: /api/organizations
---
......

tags

drill --benchmark example/benchmark.yml --tags tag_user 

skip-tags

drill --benchmark example/benchmark.yml --skip-tags tag_user

[fcsonline]

Sorry for this late answer, I have been really busy these weeks.

Really impressive addition! I checked the code and it looks ok! So, merging!