Added missing jsdocs

* Env#execute
* Env#allowRespy
* Enough of Spec to support spec filters

src/core/Env.js

@@ -83,12 +83,19 @@ getJasmineRequireObj().Env = function(j$) {
        * @default false
        */
       oneFailurePerSpec: false,
+      /**
+       * A function that takes a spec and returns true if it should be executed
+       * or false if it should be skipped.
+       * @callback SpecFilter
+       * @param {Spec} spec - The spec that the filter is being applied to.
+       * @return boolean
+       */
       /**
        * Function to use to filter specs
        * @name Configuration#specFilter
        * @since 3.3.0
-       * @type function
-       * @default true
+       * @type SpecFilter
+       * @default A function that always returns true.
        */
       specFilter: function() {
         return true;
@@ -718,7 +725,27 @@ getJasmineRequireObj().Env = function(j$) {
       queueRunnerFactory
     );
 
-    // Both params are optional.
+    /**
+     * Executes the specs.
+     *
+     * If called with no parameters or with a falsy value as the first parameter,
+     * all specs will be executed except those that are excluded by a
+     * [spec filter]{@link Configuration#specFilter} or other mechanism. If the
+     * first parameter is a list of spec/suite IDs, only those specs/suites will
+     * be run.
+     *
+     * Both parameters are optional, but a completion callback is only valid as
+     * the second parameter. To specify a completion callback but not a list of
+     * specs/suites to run, pass null or undefined as the first parameter.
+     *
+     * execute should not be called more than once.
+     *
+     * @name Env#execute
+     * @since 2.0.0
+     * @function
+     * @param {(string[])=} runnablesToRun IDs of suites and/or specs to run
+     * @param {Function=} onComplete Function that will be called after all specs have run
+     */
     this.execute = function(runnablesToRun, onComplete) {
       installGlobalErrors();
 
@@ -910,6 +937,15 @@ getJasmineRequireObj().Env = function(j$) {
       }
     });
 
+    /**
+     * Configures whether Jasmine should allow the same function to be spied on
+     * more than once during the execution of a spec. By default, spying on
+     * a function that is already a spy will cause an error.
+     * @name Env#allowRespy
+     * @function
+     * @since 2.5.0
+     * @param {boolean} allow Whether to allow respying
+     */
     this.allowRespy = function(allow) {
       spyRegistry.allowRespy(allow);
     };