Implemented avoid_crossing_perimeters with VisiLibity
Update MANIFEST and test
Merge branch 'master' into visilibity

Conflicts:
	lib/Slic3r/GCode.pm
	xs/MANIFEST
Fix MANIFEST
Simplify islands before initializing MotionPlanner
New implementation of Avoid crossing perimeters using Voronoi diagrams
New utility script to convert config bundles into a single config file
Fixed test relying on old layer_height default value
Always use a rectangle with semicircles as extrudate shape
Refactoring: moved direction-specific methods to new role class Slic3r::Fill::WithDirection
New 3D Honeycomb infill pattern (credits: David Eccles (gringer)). #1646
Prevent warnings when zooming on uninitialized 3D canvas
Merge branch 'acp-voronoi'

Conflicts:
	xs/xsp/my.map
Merge pull request #30 from alexrj/master

Merge from master