Fix collectd conf dir path parameter assignment
collectd_version fact use fix

It probably never worked, but I don't have time to test this for now.
Varnish plugin package installation correction
Change write_graphite plugin storerates default

Fixes #106
Reportbytes option on swap plugin only for collectd > 5.2
Merge pull request #111 from jpoittevin/swap

Remove reportbytes option on swap plugin
Merge pull request #113 from jpoittevin/fix-path-param

Fix collectd conf dir path parameter assignment
Merge pull request #115 from jpoittevin/varnish-fixup

Varnish fixup
Merge pull request #116 from jpoittevin/write-graphite-default

Change write_graphite plugin storerates default