Misc. Fixes and Changes

- Adds new sprite for coffee cups by Nienhaus. (http://i.imgur.com/y5TA0tu.png)
- Adds in new atmos canister type for custom mixes that does not look like a biohazard container, most likely to be used for firefighting mixes, or anesthetic. (http://i.imgur.com/6dTzCSe.png)
These can be obtained by recoloring empty canisters. (http://i.imgur.com/umjEk9J.png)
- Fixes formatting for table climb blocking, no more "You cannot climb a the reinforced table."
- Drag and drop now works for the operating table and cryodorms cryopods, borgs can now properly store away SSDs and perform surgery (minus the anesthetic). Both changes were mainly a copy/paste of already present code for sleepers/advanced body scanners, as well as code already present for both operating tables/cryosleepers used for placing someone on/in them with a grab.
- The space helmet class and all of its derived classes no longer have a 1% chance of falling off.


![image](https://cloud.githubusercontent.com/assets/8212178/5056059/4dcfc942-6c3e-11e4-81b8-53bdd96a8d54.png)