Fix dupe bug on TileAssemblyAdvancedWorkbench
Closes #634
Add Maven project object model

Build with: mvn initialize && mvn package
Temporarily hardcode version and build number

Until can replace Ant's @VERSION@ with Maven's equivalent..
Not able to use CraftBukkit's technique of reading the version
from the META-INF pom.properties:

https://github.com/Bukkit/CraftBukkit/blob/master/src/main/java/org/bukkit/craftbukkit/util/Versioning.java

because FML's @Mod version requires constants (final is insufficient,
even if the value is dynamically read in a static {} block).
Merge branch 'maven-dev' into mcpc-dev
Build against MCPC+ instead of vanilla Forge, in pom