Add Makefile for easy running of tests and coverage.

[rspier]

Add a Makefile to make it easier to run all the tests and generate and view coverage data.

[rspier]

The test failure makes no sense, as no code was changed.

[abates]

The travis build fails when pulling in dependencies:

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/travis/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/travis/gopath"
GOPROXY=""
GORACE=""
GOROOT="/home/travis/.gimme/versions/go"
GOTMPDIR=""
GOTOOLDIR="/home/travis/.gimme/versions/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build372866423=/tmp/go-build -gno-record-gcc-switches"
before_install.1
2.73s$ go get golang.org/x/tools/cmd/cover
before_install.2
1.66s$ go get github.com/mattn/goveralls
install
0.00s$ travis_install_go_dependencies master -v
Makefile detected
0.05s$ go test -coverprofile=coverage.out -coverpkg=./,./plm,./link,./cmd/... ./...
cmd/ic/device.go:24:2: cannot find package "github.com/abates/cli" in any of:
	/home/travis/.gimme/versions/go/src/github.com/abates/cli (from $GOROOT)
	/home/travis/gopath/src/github.com/abates/cli (from $GOPATH)
cmd/ic/main.go:25:2: cannot find package "github.com/tarm/serial" in any of:
	/home/travis/.gimme/versions/go/src/github.com/tarm/serial (from $GOROOT)
	/home/travis/gopath/src/github.com/tarm/serial (from $GOPATH)
The command "go test -coverprofile=coverage.out -coverpkg=./,./plm,./link,./cmd/... ./..." exited with 1.
0.01s$ $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci
Error parsing coverage: open coverage.out: no such file or directory
The command "$HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci" exited with 1.

Since I haven't ever used Makefiles with travis, I don't know what needs to be done, maybe a go dep dependency in the Makefile?

[abates]

The relevant documentation for travis is here

Looks like if we add a go get dependency to the Makefile then that will fix the issue.

If you make the appropriate change then I'll merge the request.

Thanks!

[rspier]

Please look again.

[coveralls]

Coverage remained the same at 66.227% when pulling 0a22894 on rspier:makefile into 05bd2fd on abates:master.