Skeleton update for mimosa version >= 0.10.0

This updated skeleton should work with all mimosa versions >= 0.10.0 and was tested with mimosa v0.13.5.
* Suggestions from @dbashford in issue #2 have been applied
* ~~3rd party scripts have been moved into a separate subfolder ([Scripts/vendor](https://github.com/elcattivo/Durandal-Mimosa-Skeleton/tree/134c3ef5ebac9d336753eae10057753c8329bad5/assets/Scripts/vendor)) to avoid warnings during build and to work around a bug in [mimosa-combine](https://github.com/dbashford/mimosa-combine)~~
* ~~CSS files have also been moved into a separate subfolder to work around the mimosa-combine bug~~
* Batch files have been replaced with the default mimosa [makefile](https://github.com/elcattivo/Durandal-Mimosa-Skeleton/blob/99068ac69458e6459ad6bec1bbe3d56e985ca927/makefile) and an equivalent [batch file](https://github.com/elcattivo/Durandal-Mimosa-Skeleton/blob/3f88d51b43b9b548c36d0774eed11a15d31d8498/make.bat) for windows systems
 * Additionally to the default commands a [*dist*](https://github.com/elcattivo/Durandal-Mimosa-Skeleton/blob/3f88d51b43b9b548c36d0774eed11a15d31d8498/make.bat#L42-L48) command has been added which behaves like the old [build.bat](https://github.com/BlueSpire/Durandal-Mimosa-Skeleton/blob/8a15f1482cd5cc3573786820948d0b1b9df14217/build.bat)