Fix version parsing for phantomjs 1.5 (development)

Author: Antono Vasiljev

Diff for: lib/guard/jasmine.rb

@@ -178,6 +178,8 @@ def jasmine_runner_available?(url)
     def phantomjs_bin_valid?(bin)
       if bin && !bin.empty?
         version = `#{ bin } --version`
+        # remove all but version from "1.5 (development)"
+        version = version.match(/(\d\.\d)/)[0]
 
         if !version
           notify_failure('PhantomJS executable missing', "PhantomJS executable doesn't exist at #{ bin }")