Update dictionary.erx

Get it from:
http://www.juniper.net/techpubs/software/junos/junos121/radius-dictionary/unisphereDictionary_for_JUNOS_v12-1.dct
Update dictionary.juniper

Get it from:
http://kb.juniper.net/library/CUSTOMERSERVICE/technotes/juniper.dct
http://www.juniper.net/techpubs/en_US/junos-space12.1/topics/task/configuration/platform-radius-server-configuring.html
Merge pull request #487 from kokel/dict_updates

Updated dictionary.erx / dictionary.juniper