Add grunt task for wrapping files and maintaining source mappings.
Add extra target lists to targetConfig.
Add native implementation detection to target-loader.js.
Working build definitions for minimized minifill and maxifill.
Check Element.animate exists as part of minifill loading decision.
Added Element.animate check to target-loader
Merge pull request #160 from shans/guarding

Updated Gruntfile to build minifill and maxifill targets that will fall back on native implementation when available.