migrating tinyGSN android app
adding README
adding license text
add server side Google Cloud Messaging
non-unique timestamps display solved by using primary key to select latest value
Merge branch 'master' into opensense
Merge pull request #28 from LSIR/tinyGSN

Merging current version of Tiny GSN corresponding to the latest state in the google code project.
Merge branch 'master' of https://github.com/LSIR/gsn
updating changes and version number
Merge branch 'master' into opensense
attempt to merge empty query checking with enumeration creation
optimization specific for opensense case: can be used if no query is specified on the view (in config file).
Every new data-item will then be visible when inserted, so the function always returns true.