Feature: Put some data inside the script tag [closes #8]

[matejlauko]

Adds possibility to put some content/data inside the script tag. Script can than use those values. Closes #8

It is not used widely, but one of the examples is Linkedin share button code, which reads language setting from inside the script tag and it can't be set in any other way:

<script src="//platform.linkedin.com/in.js" type="text/javascript">
    lang: en_US
</script>

This content is set via children, so for example:

<Script url="//platform.linkedin.com/in.js">lang: en_US</Script>

Nothing else than string should be inserted inside the script tag..