Precompile CKEditor plugins in use.
Precompile CKEditor plugins in use.

As stated in #1196, compiling everything related to CKEditor made
compilations slower. However, not compiling any plugins meant Travis had
to compile them while running a test. It often resulted in a test
failing because the time Travis took to compile the plugins the
application uses exceeded Capybara's wait time.

AyuntamientoMadrid/participacion,usabi/consul_san_borondon,deivid-rodriguez/participacion,consul/consul,AyuntamientoPuertoReal/decidePuertoReal,AjuntamentdeCastello/consul,AjuntamentdeCastello/consul,consul/consul,deivid-rodriguez/participacion,consul/consul,deivid-rodriguez/participacion,AyuntamientoMadrid/consul,AjuntamentdeCastello/consul,CDJ11/CDJ,usabi/consul_san_borondon,AyuntamientoMadrid/participacion,AyuntamientoMadrid/consul,AyuntamientoMadrid/consul,AyuntamientoMadrid/participacion,CDJ11/CDJ,AyuntamientoPuertoReal/decidePuertoReal,AyuntamientoMadrid/participacion,consul/consul,AyuntamientoPuertoReal/decidePuertoReal,CDJ11/CDJ,usabi/consul_san_borondon,consul/consul,AyuntamientoMadrid/consul,deivid-rodriguez/participacion,usabi/consul_san_borondon,CDJ11/CDJ,AjuntamentdeCastello/consul