Merge pull request #18 from sstublic/master

Added database connectivity and db_owner role check.
Bugfix: ApplyPackages.bat fails on space in package's folder name.
Better comment.
Merge branch 'master' of https://github.com/Rhetos/Rhetos
Typo.
Bugfix: Reference to an SqlQueryable causes SQL error on deployment.
ORM functionality for reference should work, but the foreign key constraint should not be created.
Build 0.9.17.2.
Enabled use of UseExecutionContext on ComposableFilterBy.
Minor build and testing improvements.
New persistence control mode: ComputeForNewItems.