move all rails unit tests to rspec
run rspec in ci
rest: use yajl to parse json from fluent

To workaround this issue here too
https://github.com/opinsys/fluent-plugin-puavo/commit/c572b843b0bebf22667e7d89d0fed272cd2ffffd
fix generic_test_helpers in cucumber
Do not reload model after printer add

reload clears some attributes that are not actually nil
No need to call save after adding printer

It's implicit
puavo-web: test school information after change of printer permissions
Revert "puavo-web: test school information after change of printer permissions"

school.puavoAllowGuest and school.puavoAllowGuest are nil by default so
the th add_printer reload issue does not appear here. This is covered
with rspec now at least.

This reverts commit ea1a141dc12b0282d9105770d19e1724a5ccd35c.
Merge branch 'master' of github.com:opinsys/puavo-users