Issue title: [1.4.0] Server Crash when right clicking a fully grown Pneumaticcraft Crop
 Issue body: Server crashed when I right clicked a fully grown 10/10/10 Helium Seed. Breaking full grown Helium Seeds crops while breeding them however did not cause a crash.

Crash Report: http://pastebin.com/F1p5BSau
 Comments: 
 Comment 0: This will only crash in SMP because of missing @SideOnly(Side.CLIENT) annotations in PneumaticCraft's classes (see also #234). I made a pr to add but apparently I also overlooked some methods.
MineMaarten told me that the pneumaticcraft crops are deprecated, so I won't bother with this anymore.
Simply disable PneumaticCraft support in the config (as of the next version).
{'source': 'GithubIssues', 'repo_name_with_owner': 'InfinityRaider/AgriCraft', 'issue_id': 92391465, 'repo_stars': 116.0}