Update dependencies (#200)

update buildToolsVersion
    update rxMarkDown
    update support libs
    remove this, because it seems not to be needed (?)
```
-    compile 'io.reactivex:rxandroid:1.2.0'
-    compile 'io.reactivex:rxjava:1.1.5'
```

.travis.yml

@@ -5,7 +5,7 @@ jdk: oraclejdk8
 android:
   components:
     - tools
-    - build-tools-25.0.1
+    - build-tools-25.0.2
     - android-25
     - extra-android-m2repository
 

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion '25.0.1'
+    buildToolsVersion '25.0.2'
 
     defaultConfig {
         applicationId "it.niedermann.owncloud.notes"
@@ -24,12 +24,10 @@ android {
 }
 
 dependencies {
-    compile 'com.yydcdut:rxmarkdown:0.0.9-beta'
-    compile 'io.reactivex:rxandroid:1.2.0'
-    compile 'io.reactivex:rxjava:1.1.5'
-    compile 'com.android.support:support-v4:25.3.0'
-    compile 'com.android.support:appcompat-v7:25.3.0'
-    compile 'com.android.support:design:25.3.0'
-    compile 'com.android.support:recyclerview-v7:25.3.0'
+    compile 'com.yydcdut:rxmarkdown:0.1.0'
+    compile 'com.android.support:support-v4:25.3.1'
+    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:design:25.3.1'
+    compile 'com.android.support:recyclerview-v7:25.3.1'
     compile fileTree(dir: 'libs', include: ['*.jar'])
 }

app/src/main/java/it/niedermann/owncloud/notes/util/MarkDownUtil.java

@@ -26,7 +26,7 @@ public class MarkDownUtil {
                 .setHeader4RelativeSize(1.15f)
                 .setHeader5RelativeSize(1.1f)
                 .setHeader6RelativeSize(1.05f)
-                .setHorizontalRulesHeight(1)
+                .setHorizontalRulesHeight(2)
                 .setLinkColor(ResourcesCompat.getColor(context.getResources(), R.color.primary, null))
                 .build();
     }