[FEATURE] Place recently used currency pairs on top (RT-1876)

* Change to "recently used" instead of "recently traded".
* Add watch in rpCombobox in order to update list at once.
[TEST] Integrate Travis with Gitter.
[FIX] 'Load More' on history tab ignores date filter (RT-1843)
Merge pull request #1383 from justmoon/travis_gitter

Integrate Travis with Gitter
Merge pull request #1384 from Madsn/patch-load-more-rt-1843

[FIX] 'Load More' on history tab ignores date filter (RT-1843)
Merge pull request #1381 from orzFly/patch-recent-pair

[FEATURE] Place recently used currency pairs on top (RT-1876)
[FIX] Button UI: Delete btn-cancel css styling
Merge pull request #1385 from yongsoo/develop

[FIX] Button UI: Delete btn-cancel css styling