Remove hardcoded database name sentence_database

We want to sort different kind of stuff ...
Merge pull request #25 from HackerPartie/master

Merge pull request #24 from HackerPartie/manu_branch
Remove hardcoded database name sentence_database

We want to sort different kind of stuff ...
move database setup to postgresql synthax
Load of stuffs:

  * Add postgresql to pom.xml
  * Rename Object property to Subject in Sentence Model
  * Rename table to sentence_svc ( subject verb complement) in case we want to exapnd to other sentences model
Add link to wiki
Merge conflict resolution
Merge pull request #27 from HackerPartie/manu_branch

Manu branch