Removed the now unneeded RTG and added another build system output directory to the .gitignore

.gitignore

@@ -7,6 +7,7 @@
 /build/
 /bin/
 /out/
+/assets/
 
 # Eclipse files:
 /eclipse/

build.gradle

@@ -122,7 +122,6 @@ dependencies {
 	// right...  This only works because of CodeChickenCore Magic being included
 	// up above...
 	compile "dan200.computercraft:ComputerCraft:1.75"
-	compile "org.teamrtg.RTG:RTG:1.7.10-1.1.1.7:dev"
 	compile "openblocks:OpenBlocks:1.7.10-1.6-1.7.10:deobf"
 	compile "ic2:IC2Classic:1.2.1.8:dev"
 }