Split boot.js in two to allow the env to be configured in between

This is mainly intended to support jasmine-browser-runner, which will load
a script that configures the env in between the two boot files (boot0.js and
boot1.js). The single-file boot.js is retained for now but will be removed
in a future release.

lib/jasmine-core/core.py

@@ -58,6 +58,11 @@ class Core(object):
         js_files.remove('boot.js')
         js_files.append('boot.js')
 
+        # Remove the new boot files. jasmine-py will continue to use the legacy
+        # boot.js.
+        js_files.remove('boot0.js')
+        js_files.remove('boot1.js')
+
         return cls._uniq(js_files)
 
     @classmethod
@@ -86,4 +91,4 @@ class Core(object):
 
             seen[marker] = 1
             result.append(item)
-        return result
+        return result