Removed unused imports
Simplify ifs
Use foreach loops instead as they're more readable
Use Collections.addAll instead of foreach loop
Removed redundant variables
Use Java 7 language features for generics
Removed type casts that's not needed
Removed useless arrays
Use MultiKeyMap for substances to avoid looping through them all in getElementBySymbol
Merge branch 'master' of https://github.com/Nacorpio/chemicraft

Conflicts:
	java/com/periodiccraft/pcm/core/element/Element.java
	java/com/periodiccraft/pcm/core/element/pH.java
Fixed crash when hovering over items
Merge pull request #1 from MysteriooN/master

Cleaned up some code, fixed crash when hovering over items and changed to MultiKeyMap in SubstanceRegistry