add length method
format
fix text rendering with line placement on corners
fix image painted
add c++ test image painted
Add missing input srid in test

Happens to work without srid specification due to && operator not
re-checking in newer postgis, but would fail with older postgis.
add font-feature-settings
add visual test font-feature-settings
text ligatures off when character-spacing > 0
update visual tests
link shapeindex to libicuuc - fixes #2419
be able to pass down scale_factor to python grid renderering
fix feature test to expect exception
visual tests: test grids + 2x scale_factor
travis: test JOBS=1
Merge pull request #2421 from strk/master-srid-in-test

Add missing input srid in test
Merge pull request #2418 from mapycz/fix-image-painted

fix image painted
Merge pull request #2416 from mapycz/add-font-features

add font-feature-settings
enable painted for svg_renderer

Conflicts:
	include/mapnik/svg/output/svg_renderer.hpp
fix return of painted in grid_renderer