Set development veresion to 0.2.0

- Incompatible changes require a min version increase
- Upgrade gradle wrapper to 1.8
- Make publishLocal publish to mavenLocal
Return collection instead of String from changes task

- Add internal method for onlyIf closure
Read this and super class names
Rename ClassNameCollector -> ClassInfo

- Extract collectFile method
Add subclasses() method to list a class' subclasses

- Detect subclasses
- Add more info logging
- Add and enforce srcClassPath
Add test project
Clean up comments and syntax
Merge remote-tracking branch 'upstream/master' into detect_subclasses

Conflicts:
	build.gradle
Use relative paths when detecting file changes
Merge pull request #5 from jonathanle/detect_subclasses

Detect subclasses