MIT license
set_layer_attr
use set_layer_attr
use set_layer_attr
use set_layer_attr
use set_layer_attr
Remove usage of float

Applying ron064 idea (https://github.com/pebble-bike/PebbleBike-PebbleWatchFace/issues/8)

Memory usage:
=============
Before
* Total app footprint in RAM:      17130 bytes / ~24kb
* Free RAM available (heap):        7446 bytes

After
* Total app footprint in RAM:      15346 bytes / ~24kb
* Free RAM available (heap):        9230 bytes
Round speed instead of truncate them
Merge pull request #6 from jay3/feature_license

MIT license
Merge branch 'feature_remove_float' into 1.4
Bugfix: remove artefacts on map
set_layer_attr_full instead of set_layer_attr to save more memory

Thanks ron064's idea

Free RAM available (heap): 7954 => 7790  (-164 bytes)
Merge pull request #7 from ron064/ReduceMem

Thanks a lot for your help!
Merge remote-tracking branch 'github_pb/master' into ReduceMem
Merge remote-tracking branch 'github/feature_remove_float'
Merge branch 'debug_map'
v1.4.2
Prevent unwanted exit

To leave the app: double click or long click (1.5s) the back button
More points on map
Unused code