browser/test/tested-browsers: tested browsers in a versioned file

Closes #3701.

browser/test/launch_functional_tests

 # sh launch_functional_tests functional/test_*rb
 
 FUNCTIONAL_TESTS=$*
+BROWSER_LIST=./tested-browsers
 
 rename_reports_in() {
     dir="$1"
@@ -21,14 +22,14 @@ EXIT=0
 if [ -z "$FUNCTIONAL_CLIENT_BROWSER_PATH" ]; then
     FUNCTIONAL_CLIENT_BROWSER_PATH="."
 fi
-for browser in $FUNCTIONAL_CLIENT_BROWSER_PATH; do
+cat $BROWSER_LIST | while read browser ; do
     echo
     echo "\033[1m\033[33m===== Testing browser: " $browser "\033[0m"
     echo
     for file in $FUNCTIONAL_TESTS; do
         echo "\033[34m===" $file "\033[0m"
         if [ ${#browser} -gt 1 ]; then
-            export WATIR_BROWSER_PATH="$browser"
+            export WATIR_BROWSER_PATH="$FUNCTIONAL_CLIENT_BROWSER_PATH/$browser"
         fi
         ruby -I functional $file;
         TMP_EXIT=$?

browser/test/tested-browsers

+firefox/v32/firefox
+firefox/v45/firefox