Upgraded 
- Gpars to v1.2.1
- Slf4j to v1.7.7
- Logback to v1.1.1
Fixed typo
Fix issue #7 - NoClassDefFoundError HashMap$Entry exception with Java 8
Fixed test paths
Enhanced launch script: 
- removed '-Xms' Java option
- verify the Java version coherent with JAVA_HOME definition
- improved error messages
Update version number to 0.8.2
Merge branch 'master' of github.com:nextflow-io/nextflow