add local weather, chart activity and fix orientation bug

float parsing with null check and nan as default

app/build.gradle

@@ -6,8 +6,8 @@ android {
         applicationId "de.weseng.wifiweatherstation"
         minSdkVersion 26
         targetSdkVersion 28
-        versionCode 20190310
-        versionName "2019.3.10"
+        versionCode 20190317
+        versionName "2019.3.17"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -18,6 +18,10 @@ android {
     }
 }
 
+repositories {
+    maven { url 'https://jitpack.io' }
+}
+
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.android.support:appcompat-v7:28.0.0'
@@ -27,4 +31,5 @@ dependencies {
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
     implementation 'com.android.support:design:28.0.0'
+    implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha'
 }