Scaffolding: Allow operations based on line number/regex besides placeholders

[marcooliveira]

You don't always have control over the files you are trying to operate on, so having the ability to work with line numbers or regular expressions would be really useful. We could simply have some match_type option that changed what the keys in the data option meant, defaulting to placeholder.

This option would support the following:

• placeholder (default)
• line - note that this one can create some issues, since as stuff gets appended/replaced inside the file, the line number will be changing, so we need to think this through, and plan how we really want it to perform
• regex

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[satazor]

I like this, specially the regexp. I would be using it to add cache busting to urls in css, and index files.

[satazor]

Would also be good to have conditionals to be evaluated inside, just like a normal javascript template. Need to discuss this.