refs #5: support FindBugs eclipse plugin configuration.
refs #5: let cli to call findbugs eclipse plugin configuration.
Merge branch 'master' into findbugs-eclipse
fix broken test case by 5460cf75.
refs #5: initialize Eclipse workspace.
fix broken test case by 5460cf75.
performance improvement: postpone downloading Eclipse from WEB
performance improvement: omit needless file copy.
Merge branch 'findbugs-eclipse'
introduce coveralls to check coverage.