chore(tests): make tests posix compatible (#109)

pkg/hook/test/test_error.sh

@@ -1,6 +1,6 @@
-#!/bin/bash
+#!/bin/sh
 
 echo "Running error test script..."
 
 echo "Expected error"
-exit 1
+exit 1

pkg/hook/test/test_simple.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 echo "Running simple test script..."
 

pkg/hook/test/test_timeout.sh

@@ -1,12 +1,12 @@
-#!/bin/bash
+#!/bin/sh
 
 echo "Running timeout test script..."
 
-for i in {1..5}; do
+for i in `seq 5`; do
   sleep .5
   echo "running..."
 done
 
 echo "This line should not be executed!"
 
-exit 0
+exit 0