Build with non-standard allocators

Author: axic

circle.yml

@@ -34,3 +34,5 @@ jobs:
              cargo build --release --no-default-features --features experimental
              cargo build --release --features experimental,debug
              cargo build --release --no-default-features --features experimental,debug
+             cargo build --release --features wee_alloc
+             cargo build --release --features qimalloc