Improve clear of runtime cache.

lib/core/ResolveCache.js

@@ -273,6 +273,16 @@ ResolveCache.prototype.list = function () {
 // ------------------------
 
 ResolveCache.clearRuntimeCache = function () {
+    // Note that _cache refers to the static _cache variable
+    // that holds other caches per dir!
+    // Do not confuse it with the instance cache
+
+    // Clear cache of each directory
+    this._cache.forEach(function (cache) {
+        cache.reset();
+    });
+
+    // Clear root cache
     this._cache.reset();
 };
 

lib/core/resolvers/GitResolver.js

@@ -331,6 +331,7 @@ GitResolver.branches = function (source) {
 };
 
 GitResolver.clearRuntimeCache = function () {
+    // Reset cache for branches, tags, etc
     mout.object.forOwn(GitResolver._cache, function (lru) {
         lru.reset();
     });