Factor out an unused argument for pressure checks.
Fix a problem with meters becoming indestructible after the pipe they're attached to is deleted.
Resolve issue #180 - Igniters not destructing properly
Merge branch 'Bleeding-Edge' of github.com:d3athrow/vgstation13 into Bleeding-Edge
Merge pull request #183 from N3X15/Bleeding-Edge

Fix bugs with igniters and meters