[fix_jira_143] Use new version of mind-parent (7-SNAPSHOT).

    Changed mind-compiler version from 2.1-SNAPSHOT to 2.2-SNAPSHOT.
    Modified .travis.yml to build mind-parent 7-SNAPSHOT before validation.
    Removed testng classifier markers in pom.xml files.
    Changed access rights on fractal-runtime output directory.
Merge pull request #24 from valeriebertin/fix_jira_143

[fix_jira_143] Use new version of mind-parent (7-SNAPSHOT).