Creates two user utility functions

docs/kickstart/user/exists?.md

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+# kickstart.user.exists? user
+Checks if `user` already exists
+
+
+### Example
+
+```bash
+$ kickstart.user.exists? root || echo Root-less
+```

docs/kickstart/user/homeFolder.md

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+# kickstart.user.homeFolder user
+
+Looks up the `user` home folder on the `/etc/passwd` file.
+
+### Example
+
+```bash
+$ kickstart.user.homeFolder vagrant
+/home/vagrant
+
+$ kickstart.user.homeFolder root
+/root
+
+$ kickstart.user.homeFolder no-user-existing
+
+```