linting: replace megacheck with metalinter

Makefile

@@ -2,6 +2,7 @@ GOTOOLS = \
 					github.com/mitchellh/gox \
 					github.com/tcnksm/ghr \
 					github.com/Masterminds/glide \
+					github.com/alecthomas/gometalinter
 
 PACKAGES=$(shell go list ./... | grep -v '/vendor/')
 BUILD_TAGS?=tendermint
@@ -79,8 +80,8 @@ ensure_tools:
 
 ### Formatting, linting, and vetting
 
-megacheck:
-	@for pkg in ${PACKAGES}; do megacheck "$$pkg"; done
-
+metalinter: ensure_tools
+	@gometalinter --install
+	gometalinter --vendor --deadline=600s --enable-all --disable=lll ./...
 
 .PHONY: install build build_race dist test test_race test_integrations test100 draw_deps list_deps get_deps get_vendor_deps update_deps revision tools