Check if table exists in DB about angular-websql

[raynoppe]

Added another in order to do a custom query:

plainQuery: function(query){
var deferred = $q.defer();
db.transaction(function(tx) {
tx.executeSql(query, [], function(tx, results) {
deferred.resolve(results);
}, function(tx, e){
console.log("There has been an error: " + e.message);
deferred.reject();
});
});
return deferred.promise;
},

Use in code:
$scope.db.plainQuery("SELECT * FROM projects ORDER BY projectName ").then(function(results) {
s.projects.list = [];
for(var i=0; i < results.rows.length; i++){
s.projects.list.push(results.rows.item(i));
}
console.log(s.projects.list);
});