support for writing RDF
small user model example
Merge branch 'dev' into lod

* dev: (67 commits)
  include unit in statistics (fixes #56)
  purged measurement activities (fixes #55)
  fixed track bulk upload with only a sensor referenced in the track
  added validation for "date" format (closes 51)
  adjusted user schema
  fixed typo
  fixed request schema validation
  addtional user profile attributes
  sort tracks by recently modified (fixes #54)
  unified track/measurment creation (sensor reference)
  removed unnecessary type literal
  do not modify query parameters
  generic filters for sensor attributes (closes #42)
  abilitiy to parse arbitrary sensor properties
  allow arbitrary maps as sensor properties
  filter sensors by type (see #42)
  removed obsolete classes
  remodeled sensors close #47
  remodeled sensor
  throw 409 for already existing mail addresses (fixes #52)
  ...

Conflicts:
	pom.xml
	rest/pom.xml
	rest/src/main/java/io/car/server/rest/MediaTypes.java
	rest/src/main/java/io/car/server/rest/encoding/GroupEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/MeasurementEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/PhenomenonEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/SensorEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/SensorsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/TrackEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/UserEncoder.java
Merge branch 'dev' into lod

* dev:
  switched deployments to https
  Activity stream of friends (fixes #57)
  fixed user/gender update issue
Merge branch 'dev' into lod

* dev: (73 commits)
  fixed 500 for HEAD method
  accept image/jpeg accept header at avatar resource
  track validation test
  fixed track schema
  more GeoJSON de/encoding tests
  simplified validation of schemas
  simplified validation tests
  JUnit Guice Runner
  changed error encoding
  schema support for geometry collections
  more explicit access restrictions
  test for schema validation
  fixed invalid activity schema (closes #60)
  wrong mail address
  JavaDoc TODO's
  splitted service class
  restore rights
  validate coordinate bounds for bboxes
  simplified filtering
  query measurements by bbox/track/user
  ...

Conflicts:
	core/src/main/java/io/car/server/core/FriendService.java
	core/src/main/java/io/car/server/core/event/ChangedGroupEvent.java
	core/src/main/java/io/car/server/core/event/CreatedGroupEvent.java
	core/src/main/java/io/car/server/core/event/CreatedPhenomenonEvent.java
	core/src/main/java/io/car/server/core/event/CreatedSensorEvent.java
	event/src/main/java/io/car/server/event/guice/HTTPPushModule.java
	rest/src/main/java/io/car/server/rest/MediaTypes.java
	rest/src/main/java/io/car/server/rest/auth/SecurityContextImpl.java
	rest/src/main/java/io/car/server/rest/encoding/ActivitiesEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/ActivityEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/EntityEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/GeoJSONEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/GroupEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/GroupsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/MeasurementEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/MeasurementsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/PhenomenonEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/PhenomenonsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/SensorEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/SensorsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/StatisticEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/StatisticsEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/TrackEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/TracksEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/UserEncoder.java
	rest/src/main/java/io/car/server/rest/encoding/UsersEncoder.java
	rest/src/main/java/io/car/server/rest/provider/AbstracJsonProvider.java
	rest/src/main/java/io/car/server/rest/provider/AbstractEntityProvider.java
	rest/src/main/java/io/car/server/rest/provider/AbstractMessageBodyReader.java
	rest/src/main/java/io/car/server/rest/provider/ActivitiesProvider.java
	rest/src/main/java/io/car/server/rest/provider/GroupsProvider.java
	rest/src/main/java/io/car/server/rest/provider/JsonNodeMessageBodyReader.java
	rest/src/main/java/io/car/server/rest/provider/JsonNodeMessageBodyWriter.java
	rest/src/main/java/io/car/server/rest/provider/MeasurementProvider.java
	rest/src/main/java/io/car/server/rest/provider/PhenomenonProvider.java
	rest/src/main/java/io/car/server/rest/provider/PhenomenonsProvider.java
	rest/src/main/java/io/car/server/rest/provider/SensorsProvider.java
	rest/src/main/java/io/car/server/rest/provider/StatisticsProvider.java
	rest/src/main/java/io/car/server/rest/provider/TrackProvider.java
	rest/src/main/java/io/car/server/rest/provider/UserReferenceProvider.java
	rest/src/main/java/io/car/server/rest/rights/MeasurementRights.java
seperated JSON and RDF encoders
RDF plugin mechanism
enabled (empty) rdf output for all resources
Merge branch 'dev' into lod

* dev:
  statistics for sensors (fixes #46)
base uri and prefixes
vcard prefix
FOAF vocab
Merge branch 'dev' into lod

* dev:
  installation guide
  example mongo.properties
added VSO linker for sensors
merged lod-vso
Merge branch 'dev' into lod

* dev:
  fixed friend/unfriend bug
  allow usernames with 4 chars
  fixed friending of other users
  fixed group joining (fixes #80)
  removed mongo deps from event project
Added rights property of Dublin-Core to User, Sensor, and Track.
Added dublin core licence rights property for phenomenons
Added content to classes :)
formatting