Efficiency of isValidAcceptor methods.
Fix Portable Tank NPE
Merge branch 'master' into development

Conflicts:
	src/main/java/mekanism/common/tile/TileEntityPortableTank.java
Merge branch 'development' into v8
Making a start on Gas Centrifuge.
Heat Transmission.
Heat Generator changed to use the new heat mechanic. Not balanced or anything yet, more a proof of concept.