modified templates to dereference class parameters

Hardcoding references to $snmpd::params::foo in the templates means that
the parameters passed into the class get dropped on the floor. :)
Merge pull request #2 from hakamadare/template_params_fix

Modified templates to dereference class parameters
Bump module version for Puppet Forge release
Update Travis-CI config file to test 2.7.18
Update rspec tests for new rspec version.

Apparently Travis-CI was telling me that there was a new version of
rspec that changes iexpect 'should' to 'to'.
Converted to puppetlabs_spec_helper.

Also updated Travis-CI config.
adding $snmp::server::visible_oids parameter

allows passing a string or array of strings describing OIDs to be
exposed via snmpd
Merge branch 'snmpd_oid_restrictions' into fas_snmp

try pulling in new branch to support specification of OID settings