Maintenance: batch of minor changes (#183)

* exclude build artifacts from git
* build: simplify building by using src-d/ci
* bench: simplify&fix shell runners
* build: simplify benchmarks* targets
* test: remove dependency on single test suite
* doc: rel image link + linguist cli difference highlight
* suggestions from code review
* bench: add fail fast to all shell runners

Signed-off-by: Alexander Bezzubov <bzz@apache.org>

benchmarks/parse.sh

@@ -1,5 +1,7 @@
-#!/bin/sh
-
-cd benchmarks/output && go run ../parser/main.go -outdir ../csv && \
-cd ../csv && go run ../parser/main.go -distribution
+#!/usr/bin/env bash
+set -e
 
+cd benchmarks/output
+go run ../parser/main.go -outdir ../csv
+cd ../csv
+go run ../parser/main.go -distribution

benchmarks/run-benchmarks.sh

@@ -1,4 +1,6 @@
-#!/bin/sh
+#!/usr/bin/env bash
+set -e
 
-mkdir -p benchmarks/output &&  go test -run NONE -bench=. -benchtime=120s -timeout=100h >benchmarks/output/enry_total.bench && \
-benchmarks/linguist-total.rb 5 >benchmarks/output/linguist_total.bench
+mkdir -p benchmarks/output
+go test -run NONE -bench=. -benchtime=120s -timeout=100h > benchmarks/output/enry_total.bench
+benchmarks/linguist-total.rb 5 > benchmarks/output/linguist_total.bench

benchmarks/run.sh

@@ -1,4 +1,7 @@
-#!/bin/sh
+#!/usr/bin/env bash
+set -e
 
-benchmarks/run-benchmarks.sh && make benchmarks-slow && \
-benchmarks/parse.sh && benchmarks/plot-histogram.gp
+benchmarks/run-benchmarks.sh
+make benchmarks-slow
+benchmarks/parse.sh
+benchmarks/plot-histogram.gp