Fix syntax issues with conditional statements.

provision.sh

@@ -51,7 +51,7 @@ apache_go() {
 	sed -i "s/^\(.*\)www-data/\1vagrant/g" ${apache_config_file}
 	chown -R vagrant:vagrant /var/log/apache2
 
-	if [ !-f "${apache_vhost_file}" ]; then
+	if [ ! -f "${apache_vhost_file}" ]; then
 		cat << EOF > ${apache_vhost_file}
 <VirtualHost *:80>
     ServerAdmin webmaster@localhost
@@ -84,7 +84,7 @@ php_go() {
 	sed -i "s/display_startup_errors = Off/display_startup_errors = On/g" ${php_config_file}
 	sed -i "s/display_errors = Off/display_errors = On/g" ${php_config_file}
 
-	if [ !-f "{$xdebug_config_file}" ]; then
+	if [ ! -f "{$xdebug_config_file}" ]; then
 		cat << EOF > ${xdebug_config_file}
 zend_extension=xdebug.so
 xdebug.remote_enable=1
@@ -97,12 +97,12 @@ EOF
 	service apache2 reload
 
 	# Install latest version of Composer globally
-	if [ !-f "/usr/local/bin/composer" ]; then
+	if [ ! -f "/usr/local/bin/composer" ]; then
 		curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 	fi
 
 	# Install PHP Unit 4.8 globally
-	if [ !-f "/usr/local/bin/phpunit" ]; then
+	if [ ! -f "/usr/local/bin/phpunit" ]; then
 		curl -O -L https://phar.phpunit.de/phpunit-old.phar
 		chmod +x phpunit-old.phar
 		mv phpunit-old.phar /usr/local/bin/phpunit