Update Travis to install Mirage2 prerequisites and build Mirage2
Improve memory management in Unit Tests. Add a cleanupContext() method
for better context management.
Enable a quick version of 'mvn install' for Travis CI
Minor POM reorganization. Ensure plugins related to Unit Testing are
only enabled when Unit Testing is enabled.
Merge pull request #637 from tdonohue/DS-2133-new

DS-2133 : Update Travis to install Mirage2 prerequisites and build Mirage2
Misplaced exclamation marks in dspace.bat
Merge branch 'master' of https://github.com/DSpace/DSpace