DS-1823 move dspace.url to build.properties

dspace.url is now independent from baseUrl
Update testEnvironment.properties

to fix the configuration load fail
Update build.properties

keep referring to baseUrl by default but allow override in build.properties
Merge pull request #2 from rradillen/patch-6

updating test configuration to reflect build.properties
introducing dspace.ui in build.properties
adding erroneously removed baseurl again
Merge pull request #423 from bram-atmire/DS-1823

DS-1823 move dspace.url to build.properties