Fixed typo in Gruntfile; added Make tasks to compile frontend assets; Modernized the gathering of benchmark result data for the test view

Makefile

@@ -6,6 +6,16 @@ VERSION=`git describe --tags`
 build:
 	@go build -o $(NAME) -ldflags "-X git.metaunix.net/bitgoblin/blt/app.AppVersion=$(VERSION)"
 
+.PHONY: grunt
+## grunt: Compile frontend assets.
+grunt:
+	@npm run grunt
+
+.PHONY: grunt-watch
+## grunt-watch: Compile frontend assets while watching for changes.
+grunt-watch:
+	@npm run grunt watch
+
 .PHONY: run
 ## run: Build and Run in development mode.
 run: build