Travis tweaks. Speed things up by skipping 'install'. Give Maven more
memory.
Merge pull request #613 from tdonohue/travis-tweaks

Travis CI tweaks
fixed an issue where a separate webapp would be created in the dspace install folder
Merge pull request #616 from atmire/mirage2-webapp

[DS-2052] Mirage 2 separate webapp fix
first commit of MOspace theme and basic configuration
moved mospace theme files to the correct path, added messages.xml overlay
ensuring group execute permissions are set on deploy
adding default value for assetstore.dir to build.properties, so Travis can still build this branch
avoiding infinite recursion by changing assetstore.dir to dspace.assetstore.dir in build.properties