Move Main around
Revert "Make the "Back" button a POST request instead of "history.back();""

This reverts commit 02a3f2e98a31b4fd02f2d0b63d2602c07b52a8ee.

Again, for some reason, heroku does not like it :(

Conflicts:
	src/main/java/org/eel/kitchen/jsonschema/FormValidation.java
	src/main/webapp/results.jsp
Don't send the original schema in the request anymore

This was only meant to make the POST "Back" button work, and "Back" is not a
POST anymore.