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/ExceptionFormatterSpec.js

@@ -173,10 +173,13 @@ describe('ExceptionFormatter', function() {
     });
 
     it('filters Jasmine stack frames in this environment', function() {
+      const jasmineFile = (function() {
+        const trace = new privateUnderTest.StackTrace(new Error());
+        return trace.frames[2].file;
+      })();
+      expect(jasmineFile).toMatch(/\/jasmine.js$/);
       const error = new Error('an error');
-      const subject = new privateUnderTest.ExceptionFormatter({
-        jasmineFile: jasmine.private.util.jasmineFile()
-      });
+      const subject = new privateUnderTest.ExceptionFormatter({ jasmineFile });
       const result = subject.stack(error);
       jasmine.debugLog('Original stack trace: ' + error.stack);
       jasmine.debugLog('Filtered stack trace: ' + result);
@@ -196,15 +199,18 @@ describe('ExceptionFormatter', function() {
     });
 
     it('handles multiline error messages in this environment', function() {
+      const jasmineFile = (function() {
+        const trace = new privateUnderTest.StackTrace(new Error());
+        return trace.frames[2].file;
+      })();
+      expect(jasmineFile).toMatch(/\/jasmine.js$/);
       const msg = 'an error\nwith two lines';
       const error = new Error(msg);
 
       if (error.stack.indexOf(msg) === -1) {
         pending("Stack traces don't have messages in this environment");
       }
-      const subject = new privateUnderTest.ExceptionFormatter({
-        jasmineFile: jasmine.private.util.jasmineFile()
-      });
+      const subject = new privateUnderTest.ExceptionFormatter({ jasmineFile });
       const result = subject.stack(error);
       const lines = result.split('\n');
 
@@ -284,7 +290,7 @@ describe('ExceptionFormatter', function() {
       it('ensures that stack traces do not include the message in this environment', function() {
         const error = new Error('an error');
         const subject = new privateUnderTest.ExceptionFormatter({
-          jasmineFile: jasmine.private.util.jasmineFile()
+          jasmineFile: "doesn't matter"
         });
         const result = subject.stack(error, { omitMessage: true });
         expect(result).not.toContain('an error');