fix(travis): incorrectly capitalized cargo.toml

This caused cargo on a case-sensitive file-system not to find the
cargo file, which made it to look upwards in the directory structure
to find the correctly named Cargo.toml fo the 'cmn' development
project.

etc/api/shared.yaml

@@ -24,7 +24,7 @@ api:
   # all output directories are relative to the one set for the respective API
     - source: README.md
     - source: LICENSE.md
-    - source: cargo.toml
+    - source: Cargo.toml
     - source: lib.rs
       output_dir: src
 cargo:

src/mako/deps.mako

@@ -62,10 +62,10 @@ ${gen_root_stamp}: ${' '.join(i[0] for i in sds)} ${api_json_inputs} $(MAKO_STAN
 ${api_name}: ${api_common}
 
 ${api_cargo}: ${api_name}
-	(cd ${gen_root} && cargo $(ARGS))
+	cd ${gen_root} && cargo $(ARGS)
 
 ${api_doc_index}: ${api_name}
-	(cd ${gen_root} && cargo doc)
+	cd ${gen_root} && cargo doc
 	@echo "Docs for ${api_name} at $@"
 
 ${api_doc}: ${api_doc_index}