Putting main pkg in cmd subdirectory

[hairyhenderson]

Fixes #147.

This moves the main package into the cmd/gomplate subdirectory, and adds a new gomplate package, so that gomplate can be used programmatically from other Go programs, like so:

package main

import "github.com/hairyhenderson/gomplate"

func main() {
	conf := &gomplate.Config{
		InputDir:    "in/",
		OutputDir:   "out/",
	}
	gomplate.RunTemplates(conf)
}

I also unexported some structs that weren't really exported (due to being in main), and have no business being exported. This'll give some flexibility to change things without breaking others.

Signed-off-by: Dave Henderson [email protected]

[sean-]

This is fantastic, thank you!!!