Add Clear Search Query Button

[edmondchui]

Add a clear button at the end of the search input field to clear the search query upon clicking.

The clear button will only appear when the search query is non-empty.

I don't know which tool you are using the build the JS build version so I just modify the javascript in src and dist directories.

[guylabs]

Hi @edmondchui,

thanks for the PR. Could you maybe add some e2e tests if you want this feature to be merged with the master? And I use Grunt to build so you would need to execute the build task to build, test and package everything. Could you maybe do this and update the PR?

Thanks and regards,

Guy

[coveralls]

Coverage decreased (-0.7%) to 73.77% when pulling 79a29d3 on edmondchui:master into 8017199 on guylabs:master.