redirect stderr to stdout in test

test/fast/Running "nvm install" with an invalid version fails nicely

@@ -3,5 +3,5 @@
 die () { echo $@ ; exit 1; }
 
 . ../../nvm.sh
-[ "$(nvm install invalid.invalid)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
+[ "$(nvm install invalid.invalid 2>&1)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
 

test/slow/nvm install/install already installed uses it

@@ -4,7 +4,7 @@ die () { echo $@ ; exit 1; }
 
 . ../../../nvm.sh
 
-[ "$(nvm install invalid.invalid)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
+[ "$(nvm install invalid.invalid 2>&1)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
 
 # Remove the stuff we're clobbering.
 [ -e ../../../v0.9.7 ] && rm -R ../../../v0.9.7