Fixed Content-Disposition filename value and adepted resulting puppet manifest to style guide

## Content-Disposition
As I tested the application i recognized that the Content-Disposition filename was not calculated correctly (the result was 'precise.zip' with quotes).

## Puppet style guide
The resulting puppet manifest did not follow the official puppet style guide (see http://docs.puppetlabs.com/guides/style_guide.html). The main changes:
- two spaces instead of four
- no space before the ressource name (exec { 'blah': } and not exec { 'blah' :})