Added gradle wrapper scripts allowing to build without external gradle installation
Imported basic rails app.
Replaced 'ruby' by 'railsCmd' task.
Added railscmd script.
preliminary commit of H2 DBMS integration, Datanucleus ORM, configuration based on evnironment selection (dev/test/production) and simple DB fixture loader
Also restructured the backend gradle project to use the Scala Zinc compiler, enabling incremental compilation for Java und Scala sources.
This is commit has some loose ends and rough edges, it's main purpose is a preview for the rest of the team.
Merge branch 'master' into persistence

Conflicts:
	frontend/build.gradle
* Merge branch 'persistence' of into 'xmlimport'
* Conflicts:
	backend/build.gradle
* added functionality to Importer class and moved it into new package 'index_vivus'
** reads entries from a directory
** acquired information: id, keyword, keywordGroupIndex, description (wordType default Unknown)
* cleared the old 'indexvivus' package from redundant elements