Download manager rewrite (#535)

* Saving to SD working

* Rename imagePath to uri

* Handle android < 21

* Minor changes

* Separate downloader from the manager. Optimize folder lookups

* Persist downloads across restarts

* Fix for #511

* Updated ReactiveNetwork. Add some documentation

* More documentation and minor fixes

* Handle persistent notifications. Other minor changes

* Improve downloader and add documentation

* Rename pageNumber to index in Page class

* Remove unused methods

* Use chop method

* Make sure dest dir is created

* Reset downloads dir preference

* Use invalidate options menu in download fragment and fix wrong condition

* Fix empty download queue after application restart

* Use addAll method in download queue to avoid too many notifications

* Inform download manager changes

app/build.gradle

@@ -38,7 +38,7 @@ android {
         minSdkVersion 16
         targetSdkVersion 25
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
-        versionCode 13
+        versionCode 14
         versionName "0.3.2"
 
         buildConfigField "String", "COMMIT_COUNT", "\"${getCommitCount()}\""
@@ -99,7 +99,6 @@ dependencies {
 
     // Modified dependencies
     compile 'com.github.inorichi:subsampling-scale-image-view:96d2c7f'
-    compile 'com.github.inorichi:ReactiveNetwork:69092ed'
 
     // Android support library
     final support_library_version = '25.0.0'
@@ -117,14 +116,18 @@ dependencies {
     compile 'com.evernote:android-job:1.1.3'
     compile 'com.google.android.gms:play-services-gcm:9.8.0'
 
+    compile 'com.github.seven332:unifile:0.2.0'
+
     // ReactiveX
     compile 'io.reactivex:rxandroid:1.2.1'
     compile 'io.reactivex:rxjava:1.2.2'
+    compile 'com.jakewharton.rxrelay:rxrelay:1.2.0'
     compile 'com.f2prateek.rx.preferences:rx-preferences:1.0.2'
 
     // Network client
     compile "com.squareup.okhttp3:okhttp:3.4.2"
     compile 'com.squareup.okio:okio:1.11.0'
+    compile 'com.github.pwittchen:reactivenetwork:0.6.0'
 
     // REST
     final retrofit_version = '2.1.0'