bugfix/fixing issue where radioactivity profiles werent showing up

## Ready State: (Yes)

This pull request is (a bit) related to the following JIRA tickets: [ICS-120 Create basic page content type](https://imagex.atlassian.net/browse/ICS-120).

## Requirements & Dependencies

* no new dependencies

## Deployment Instructions

* Merge code.
* Maybe a feature revert is needed?
* Clear caches with `drush cc all`

## Usage/Test Instructions

* The feature wasn't including the Radioactivity Profiles properly. Reason is a wrongly named file (+1 sort of duplicate one) and a missing profile inclusion in the .info file.
* Profiles were defined in 2 files: imagex_radioactivity.inc and imagex_radioactivity_decay_profile.inc. The first seemed to contain the right profiles (someone correct me if I'm wrong) and the latter was named incorrectly. I removed the latter and renamed the first to imagex_radioactivity.radioactivity_decay_profile.inc