Add the "alwaysReset" option to BaseCollection.

This option allows for updates provided to BaseCollection.set
to simply **replace** the data array. This can improve performance
significantly.
Merge pull request #323 from andyperlitch/alwaysReset

Add the "alwaysReset" option to BaseCollection.
Merge branch 'ngConsole' of https://github.com/DataTorrent/malhar-ui-console into appdataserver