Add option to set decimal precision and step value
Merge branch 'master' of https://github.com/facebook/Tweaks

Conflicts:
	FBTweak/_FBTweakTableViewCell.m
	FBTweakExample/FBAppDelegate.m
Made indents in line with coding style
Added NSCoder to precision and step value
Merge pull request #18 from renssies/master

Add option to set decimal precision and step value