enable mod_headers on debian

mod_headers isn't enabled by default when installing apache2 on ubuntu
Removes requirement for python-txamqp

The package is unavailable for more recent versions of Debian, so it’s hard-removed here.

There may be a more elegant way of doing this.
Merge pull request #39 from otupman/master

Removes requirement for python-txamqp on Debian. Also close #38
Merge pull request #35 from axe-felix/patch-1

enable mod_headers on debian
activate mod_headers on Ubuntu

We need mod mod_header for CORS header and it is disabled on Ubuntu by default
allow redhat based systems to use a different apache port correctly
Parameterize the install of ca-certificate
Merge pull request #40 from puppetlabs-operations/parameterize_install

Parameterize the install of ca-certificate
fix little typo
fix installation of txamqp on Debian 7.4
prepare for puppetforge release 5.1.1
update license date
Add ldap parameters
Merge pull request #42 from puppetlabs-operations/master

Add ldap parameters
provide ability to disable webserver functionality within graphite module, allows for standalone webserver config outside this module
fix dependencies a little to minimise breakage
Merge pull request #43 from CpuID/master

provide ability to disable webserver functionality within graphite module
installed python-dev on debian. close #44
take two at gr_web_server = none, renamed to wsgionly, split up nginx and gunicorn configs into 2 files, include 1 or both depending on nginx or wsgionly
oops missed a spot