Added option current_scan_depth to rendererers.
Added documentation for current_scan_depth option.
Renamed current_scan_depth to currentScanDepth.
Renamed currentScanDepth to matchingDepth.
Basic tests of matchingDepth option in renderers.
Decrement matchingDepth when rendering menu with Twig.
Ensured that matchingDepth doesn't go below 0.
Added test for when matchingDepth is lower than depth.
Don't override existing extras when building item
fixed tests
CS fixes
Merge pull request #98 from sebastianljunggren/master

Add option currentScanDepth to renderers
Merge pull request #118 from Heliopsis-HQ/dont-override-extras

Dont override extras