generically convert hosts hash to php

this will allow for any per host config params to be passed through to
the php config.  plan to use this with a future version of nagdash
that has a url param for linking to the nagios web interface
fix for ruby 1.8.7 use insert instead of prepend
update readme

indicate that the host config params are generically passed to
nagdash
Merge pull request #1 from fessyfoo/generic-hostconfig-to-php

generically convert hosts hash to php