Merge pull request #243 from guillermo-carrasco/develop

No cleanup and more JVM heap space in travis-ci
Refactorization of compress_files
Does not work if I move the import statement
Avoid circular import [ci skip]
Merge pull request #244 from guillermo-carrasco/develop

Refactorization of compress_files
fixed key-error on missing demultiplex metrics
Merge pull request #245 from b97pla/develop

fixed key-error on missing demultiplex metrics
Merge pull request #246 from SciLifeLab/develop

Develop