Rename j$ to jasmineUnderTest for specs

- Clarifies what it is for when writing tests
- No longer named the same as the `jasmine` that is injected into live
  code

spec/helpers/defineJasmineUnderTest.js

@@ -1,7 +1,7 @@
 (function() {
   // By the time onload is called, jasmineRequire will be redefined to point
   // to the Jasmine source files (and not jasmine.js). So re-require
-  window.j$ = jasmineRequire.core(jasmineRequire);
-  jasmineRequire.html(j$);
-  jasmineRequire.console(jasmineRequire, j$);
+  window.jasmineUnderTest = jasmineRequire.core(jasmineRequire);
+  jasmineRequire.html(jasmineUnderTest);
+  jasmineRequire.console(jasmineRequire, jasmineUnderTest);
 })();