Configuration option to always compile all files

[tobiasrdm]

Create configuration option to always compile all files. This is useful when sourceDirectory and outputDirectory are the same and the *.jrxml and *.jasper are already stored in the sources repository (SVN or Git). In that case when it is made a checkout, targetFile.lastModified() and sourceFile.lastModified() is the checkout timestamp.

The implementation can be performed using SimpleSourceInclusionScanner instead of StaleSourceScanner.

[alexnederlof]

Closed via #31

[tobiasrdm]

Released in 2.2