Fix nrpe_check Resource Example in the README

The resource name nagios_nrpecheck is just the old one from the nagios
cookbook. Also added some missing brackets in attributes.
Merge pull request #2 from alexanderkiel/fix-readme-nrpecheck

Fix nrpe_check Resource Example in the README
Make mode a string in the LWRP
Bump to 1.0.2 for release and add change log