Adhere to naming conventions for plug-ins

de.hft-stuttgart.cityunits.feature/feature.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <feature
-      id="de.hft-stuttgart.cityunits.feature"
+      id="de.hftstuttgart.cityunits.feature"
       label="City Units"
       version="1.0.0"
       provider-name="HfT Stuttgart">
@@ -23,7 +23,7 @@ Certain units relevant to City simulations are also added.
 
    <requires>
       <import plugin="org.eclipse.emf.ecore"/>
-      <import plugin="de.hft-stuttgart.cityunits" version="1.0.0" match="greaterOrEqual"/>
+      <import plugin="de.hftstuttgart.cityunits" version="1.0.0" match="greaterOrEqual"/>
       <import plugin="org.eclipse.emf.edit" version="2.8.0" match="compatible"/>
       <import plugin="org.eclipse.core.runtime" version="3.8.0" match="compatible"/>
       <import plugin="org.eclipse.emf.databinding" version="1.3.0" match="compatible"/>

de.hft-stuttgart.cityunits.feature/pom.xml

@@ -2,7 +2,7 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
-	<artifactId>de.hft-stuttgart.cityunits.feature</artifactId>
+	<artifactId>de.hftstuttgart.cityunits.feature</artifactId>
 	<packaging>eclipse-feature</packaging>
 	<name>City Units Feature</name>