Add byTag template function.
Update test example.
Update documentation.
Remove extra padding from Go template {{ and }}
Fix indentation in template tests
Merge branch 'williambailey:bytag_function'
Add JSON and file example to README
Move Apache http example lower in README
Move shared utilities into util
Do not prefix util import
Extract test helpers into their own package
Merge pull request #46 from hashicorp/sethvargo/util

Move shared utilities into util
Make Path a public field on Template
Add helper functions for toLower, toUpper, and toTitle
Update README to shocase the new APIs
Fix failed rebase
Use parseJSON as the API method
Merge pull request #45 from hashicorp/sethvargo/template_helpers

Add more template helpers
Remove path prefixes
Replace functionality, make noop variadic