Folding build_tools back into the main repo for simplicity.

.gitignore

@@ -76,26 +76,20 @@ node_modules/**/build/
 node_modules/.bin/
 
 # coverage/etc
-scratch/
+/scratch/
 
-.anvil-cache
-.build-cache/
-build/
-build-out/
-build-gen/
-build-bin/
-build-test/
+/build/
 
 # ==============================================================================
 # Local-only paths
 # ==============================================================================
 
 .vagrant
-attic/
-content/
-third_party/binutils/binutils-2.24.tar.gz
-third_party/binutils/bin/
-third_party/binutils/powerpc-none-elf/
-third_party/binutils/share/
-third_party/binutils/binutils*
-third_party/vasm/
+/attic/
+/content/
+/third_party/binutils/binutils-2.24.tar.gz
+/third_party/binutils/bin/
+/third_party/binutils/powerpc-none-elf/
+/third_party/binutils/share/
+/third_party/binutils/binutils*
+/third_party/vasm/