Added ability to configure an custom classloader for resolve
configuration classes.
Make setClassLoader method static.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	admin-jaxrs/src/main/java/org/deephacks/confit/internal/jaxrs/JaxrsConfigEndpoint.java
	api-admin/src/main/java/org/deephacks/confit/admin/AdminContext.java
Merge pull request #1 from thiagogjt/master

Custom classloader for configuration classes.