Format README

- Use markdown ordered lists
- Add language-specific syntax highlighting
- Linkify gulp
- General formatting, wording
Rewrite unique subtask name prefixes to be the task's gulpfile's relative path. Fixes issue #4.
0.6.0
Merge pull request #5 from reidev/unique-task-name-fix

Subtask name collision fix on Unix
Merge pull request #2 from robatron/patch-1

Leverage Markdown to format README
Tabs -> spaces
Add BDD UI mocha option
Reduce spacing in formatting, concisify wording in test specs
Add argument pattern argument assersion
Merge branch 'master' of github.com:frankwallis/gulp-hub into unit-tests
Implement argument assertion check, associated test spec, and dependencies