add video cache (2017-10-22）

gsyvideoplayer-androidvideocache/build.gradle

@@ -11,8 +11,8 @@ android {
         minSdkVersion globalConfiguration.androidMinSdkVersion
         targetSdkVersion globalConfiguration.androidTargetSdkVersion
 
-        versionCode 1
-        versionName "1.0"
+        versionCode 21
+        versionName PROJ_VERSION
 
     }
     buildTypes {

gsyvideoplayer-androidvideocache/src/main/java/com/danikula/videocache/ProxyCacheException.java

 package com.danikula.videocache;
 
+import shuyu.com.androidvideocache.BuildConfig;
+
 /**
  * Indicates any error in work of {@link ProxyCache}.
  *