#414 Rename impl dep to core

pom.xml

@@ -33,7 +33,7 @@
             </dependency>
             <dependency>
                 <groupId>de.fitko.fitconnect.sdk</groupId>
-                <artifactId>impl</artifactId>
+                <artifactId>core</artifactId>
                 <version>${project.version}</version>
             </dependency>
             <dependency>
@@ -81,8 +81,8 @@
                 <groupId>ch.qos.logback</groupId>
                 <artifactId>logback-classic</artifactId>
                 <version>1.2.11</version>
-                <scope>provided</scope>
             </dependency>
+
             <dependency>
                 <groupId>com.beust</groupId>
                 <artifactId>jcommander</artifactId>