Configuration for Socket.IO has been refactored to support proxies and
replace ambiguous property names:
* Added API property `socketioPath` to `/configuration/`
* Added property `socketio.proxy-path`
* Removed property `security.ssl`
* Renamed properties:
  * `socketio.ip` -> `socketio.bind-address`
  * `security.keystore` -> `socketio.ssl.jks-file`
  * `security.storepass` -> `socketio.ssl.jks-password`

The default port to bind to has been changed from 10443 to 8090 since
SSL is not enabled by default. There is enough room (8081-8089) for
additional severs (e.g. `grunt run`) in development environments.

Use preexisting questionValue instead of freeTextScore

There is no need for a separate property. `questionValue` is used by
learning progress views.

See merge request !26

The security.*.enabled properties are now loaded as booleans.

The original implementation did not correcly implement the W3C
Recommendation (https://www.w3.org/TR/2014/REC-cors-20140116/). CORS is
now implemented based the CorsFilter provided by Spring MVC.

Origins allowed for CORS can now be set in the configuration.
Additionally, GET access to the following request URLs is allowed from
all origins:

* /
* /arsnova-config and /configuration/
* /statistics

The implementation (introduced by
2084f33a) was to permissive and posed a
security risk. As a consequence, cross origin requests requiring client
authentication are no longer possible.

Daniel Gerhardt authored 8 years ago and Tom Käsler committed 8 years ago

There is no need for a separate property. `questionValue` is used by
learning progress views.

Builds no longer depend on a preexisting config in ~/.ssh.

Daniel Gerhardt authored 8 years ago and Daniel Gerhardt committed 8 years ago

Builds no longer depend on a preexisting config in ~/.ssh.

Implements the ability to check free text answers for correctness.

Closes !21
Refs !17, !24