- removing intellij files which are now auto generated
- tweaks to gradle build
Merge branch 'gradle' of github.com:lessthanoptimal/BoofCV into gradle

Conflicts:
	build.gradle
- moved serialXML to IO package
  * first step in moving IO related stuff out of Image Processing
- Created main/checks so that a dependency doesn't need to be added between IO and Feature
- deleting IntelliJ iml files again.
  * I fail at merging apparently