IOS-221
IOS-224
IOS-208
IOS-70
IOS-211
plus/minus buttons background fix.
Merge pull request #19 from tenkfm/fork-master

IOS-208, 	IOS-221, IOS-224
IOS-218
IOS-218
Merge pull request #20 from tenkfm/fork-master

IOS-218
map ruler set minimum size
Merge pull request #21 from tenkfm/fork-master

map ruler set minimum size
Fix build
Fix build
Fix