start for jdbc-source junit tests with derby mem db
strings to constants
Removed echo.groovy from Quickstart example

The Quickstart is now using the new echo.mapper. This mapper is echoing the requisition. The script step with the echo.groovy file is repaced.
Splitting documentation and introduced sidebar for navigation
renamed iftype to MgmtType for jdbc and xls source :: removed echo.groovy from examples and added echo.mapper
Merge branch 'feature-PRIS-16-ifTypeRenaming' into develop
first minor refactorings
fixes based on code review
Merge branch 'feature-code-review-fixes' into develop
fixes based on code review
Added documentaion for the JDBC source.
Added schema for the in-memory test database
renamed requisition.merge.keepAllA to requisition.A.keepAll same same for B
change merge parameters in examples
added minimal jdbc-source test
added basic test for jdbc source
Fixed NullPointer in XLS-Source if required headers are missing. PRIS-19
fixed the missing throws statment in XlsSourceTest
Merge
added better error handling for broken ip addresses
added missing exception