Added headline for ubuntu installation
Changed headline for ubuntu installation
Added alternative installation instructions for ubuntu
merged with develop branch
added gitignore file
Merge branch 'master' of https://github.com/nansencenter/nansat into develop
Merge branch 'develop' of https://github.com/nansencenter/nansat into develop
Merge branch 'develop' of https://github.com/nansencenter/nansat into develop
Merge branch 'develop' of https://github.com/nansencenter/nansat into develop