Modify travis configuration to install valgrind

This should fix previous build failures

.travis.yml

@@ -1,2 +1,5 @@
 language: c
 script: ./scripts/travis.sh
+before_install:
+  - sudo apt-get update
+  - sudo apt-get install valgrind

scripts/travis.sh

@@ -1,12 +1,11 @@
-#!/bin/sh
+#!/bin/sh -e
 
 export VALGRIND_CHECK=1
-make cmake CMAKE_EXTRA_FLAGS="-DCMAKE_INSTALL_PREFIX=$PWD/dist" || exit 1
-make || exit 1
+make cmake CMAKE_EXTRA_FLAGS="-DCMAKE_INSTALL_PREFIX=$PWD/dist"
+make
 echo "Running tests with valgrind..."
 if ! make test > /dev/null 2>&1; then
-	failed=$(ls src/testdir/valgrind.*)
-	if [ -n "$failed" ]; then
+	if ls src/testdir/valgrind.* > /dev/null 2>&1; then
 		echo "Memory leak detected" >&2 
 		cat src/testdir/valgrind.*
 	else

src/testdir/Makefile

@@ -28,7 +28,7 @@ SCRIPTS := test1.out test2.out test3.out test4.out test5.out test6.out \
 SCRIPTS_GUI := test16.out
 
 ifdef VALGRIND_CHECK
-VALGRIND = valgrind --suppressions=../../.valgrind.supp --leak-check=yes --error-exitcode=111 --log-file=valgrind.$*
+VALGRIND = valgrind --suppressions=../../.valgrind.supp --leak-check=full --error-exitcode=111 --log-file=valgrind.$*
 endif
 
 ifdef TESTNUM