Update Skipper and Data Flow UI versions
Update Skipper and Data Flow UI versions

 Skipper to 1.1.0.RC1
 Data Flow UI to 1.7.0.BUILD-SNAPSHOT

markfisher/spring-cloud-dataflow,mminella/spring-cloud-data,markpollack/spring-cloud-dataflow,jvalkeal/spring-cloud-data,ghillert/spring-cloud-dataflow,jvalkeal/spring-cloud-data,trisberg/spring-cloud-dataflow,ilayaperumalg/spring-cloud-dataflow,markfisher/spring-cloud-data,spring-cloud/spring-cloud-dataflow,jvalkeal/spring-cloud-dataflow,markpollack/spring-cloud-dataflow,trisberg/spring-cloud-dataflow,cppwfs/spring-cloud-dataflow,trisberg/spring-cloud-dataflow,trisberg/spring-cloud-dataflow,spring-cloud/spring-cloud-data,spring-cloud/spring-cloud-dataflow,ghillert/spring-cloud-dataflow,jvalkeal/spring-cloud-dataflow,jvalkeal/spring-cloud-data,spring-cloud/spring-cloud-data,markfisher/spring-cloud-data,spring-cloud/spring-cloud-dataflow,ilayaperumalg/spring-cloud-dataflow,markfisher/spring-cloud-dataflow,markfisher/spring-cloud-dataflow,spring-cloud/spring-cloud-dataflow,spring-cloud/spring-cloud-data,ilayaperumalg/spring-cloud-dataflow,jvalkeal/spring-cloud-dataflow,spring-cloud/spring-cloud-dataflow,jvalkeal/spring-cloud-dataflow,cppwfs/spring-cloud-dataflow,mminella/spring-cloud-data,markfisher/spring-cloud-dataflow,cppwfs/spring-cloud-dataflow,markfisher/spring-cloud-data,markpollack/spring-cloud-dataflow,jvalkeal/spring-cloud-dataflow