Add bootstrap-colorpicker-rails to Gemfile

Signed-off-by: Pedro Paulo <pedro@vezza.com.br>
Revert "Add bootstrap-colorpicker-rails to Gemfile"

This reverts commit 3bf92843d60b705063519ded27802b700f70da78.
Add another colorpicker gem

This seems to import correctly

Signed-off-by: Pedro Paulo <pedro@vezza.com.br>