Added test for findMostFrequentX.
Fixed a bug in findMostFrequentX in ScoreComputer.
Added AndroidStaggeredGrid as a library.
Used StaggeredGridView instead of regular Gridview to make grid adapt to items having different length in gridview.
Solved a dependency issue.
Made Shop part of the algorithm project.
Made item reference to its shop.
Added ShopR shop.
Changed the diversity threshold to 0.90.