Polish Travis CI configuration
Polish Travis CI configuration

1. Remove duplicate Java 7 and 8 builds
2. Order build matrix by JDK version ascending
3. Utilize Maven Wrapper to ensure Maven 3.2.5 is used

CodingFabian/byte-buddy,mches/byte-buddy,raphw/byte-buddy,raphw/byte-buddy,raphw/byte-buddy,DALDEI/byte-buddy