add links
Merge branch 'master' into 0.8.17
checkout walkontable (178d87b7b8ff50f543bd5704d58217604c58da28) to a subdir
build Walkontable from source files
refactor: move legacy $.browser support from Handsontable to Walkontable
use source files directly
integrate Walkontable in Handsontable build process; create new tasks `grunt test:handsontable` and `grunt test:walkontable`