Fix DrawLine native to work with offscreen canvases
Add a test that draws lines in an offscreen Graphics
add storeSync function to ensure data synced to IDB store
Merge pull request #664 from marco-c/fix_DrawLine

Fix DrawLine native
add debug statements for store functions
Merge pull request #665 from mykmelez/store-sync

add storeSync function to ensure data synced to IDB store
Merge branch 'master' into merge-stat