make getProject take unescaped group id, like getGroup

Author: novalis

src/main/java/org/gitlab/api/GitlabAPI.java

@@ -615,7 +615,7 @@ public GitlabProject getProject(Serializable projectId) throws IOException {
      * use namespace & project name to get project
      */
     public GitlabProject getProject(String namespace, String projectName) throws IOException{
-        String tailUrl = GitlabProject.URL + "/" + namespace + "%2F" + projectName;
+        String tailUrl = GitlabProject.URL + "/" + sanitizeGroupId(namespace) + "%2F" + sanitizeProjectId(projectName);
         return retrieve().to(tailUrl, GitlabProject.class);
     }