Update authors of the plugin
Restrict usage of the plugin on GLPI 0.84.x
Create dummy method to ensure compatibility with other plugins which
create new itemtypes (plugin simcard). Will be filled to acutally handle
these new item types.
restore simcard plugin compatibility. This was a regression due to all
code changes done while forking and porting the plugin to GLPI 0.84
Merge branch 'master' of https://github.com/dethegeek/customfields

merging changes on readme.md and WIP on new features