Configure the Buld number in CircleCI


It will be nice if we have a way to configure the CircleCI build number based on the version number of the app. If the same version is build twice, it needs to be incremented.
For eg., If the verison is 0.01, then build number should be 0.01. If the next build happens with same version, the build number should be 0.01(2), 0.01(3), and so on.
So that we will get to know from CircleCI itself that exactly which version of the app is deployed to live.