Made module library path user configurable
Made module library path user configurable

See github knowshan/puppetlabs-apache#2 for details.
Allowed user to specify custom module library .so file location using
an absolute path. If the module library location string starts with a
forward slash '/', then the path is taken as an absolute path.
Otherwise, a relative path from default 'modules' directory is taken.

guegue/puppetlabs-apache,digitalmediacenter/puppetlabs-apache,yakatz/puppetlabs-apache,eputnam/puppetlabs-apache,buzzdeee/puppetlabs-apache,gerhardsam/puppetlabs-apache,gerhardsam/puppetlabs-apache,bmjen/puppetlabs-apache,svanhart/puppetlabs-apache,yakatz/puppetlabs-apache,traylenator/puppetlabs-apache,samuelb/puppetlabs-apache,puppetlabs/puppetlabs-apache,dzmitryv/puppetlabs-apache,guegue/puppetlabs-apache,puppetlabs/puppetlabs-apache,digitalmediacenter/puppetlabs-apache,dzmitryv/puppetlabs-apache,buzzdeee/puppetlabs-apache,eputnam/puppetlabs-apache,svanhart/puppetlabs-apache,FlatKey/puppetlabs-apache,bmjen/puppetlabs-apache,samuelb/puppetlabs-apache,traylenator/puppetlabs-apache,FlatKey/puppetlabs-apache