Move XF.start from xf.core.js to app/start.js, add test for new module and make related changes.
Update .travis.yml

Command grunt bower added
Merge pull request #187 from epam/core

Move XF.start from xf.core.js to app/start.js, add test for new module and make related changes.
Merge pull request #18 from epam/master

Update from upstream