Redesigned moudule system

* Top level private APIs (e.g. jasmine.private.whatever) are no longer
  exposed
* jasmineRequire is no longer exposed
* core is self-booting
* Globals are automatically created in browsers. (They can subsequently
  be removed by user code if desired.)
* Globals are *not* automatically created in Node. An installGlobals
  function is exported instead. The jasmine package calls installGlobals
  unless configured not to do so.
* In Node, the same instance is returned each time jasmine-core is
  imported. A reset function is exported. It effectively resets all state
  by discarding the env and creating a new one. This allows mulitple
  sequential runs within the same process to be independent of each
  other, but does not allow multiple concurrent runs. (That probably never
  worked anyway.)

Fixes #2094

spec/core/UtilSpec.js

@@ -163,7 +163,6 @@ describe('util', function() {
       // Chrome sometimes reports foo.js as foo.js/, so tolerate
       // a trailing slash if present.
       expect(privateUnderTest.util.jasmineFile()).toMatch(/util.js\/?$/);
-      expect(jasmine.private.util.jasmineFile()).toMatch(/jasmine.js\/?$/);
     });
   });
 });