update Copyright info

[Sorin Marian Nasoi]

There are files in lp:zorba trunk that are using an out of date copyright info:
[...]
Copyright 2006-2011 The FLWOR Foundation.
[...]

Here are some examples from 'src' folder:
./api/documentmanagerimpl.h
./api/collectionmanagerimpl.h
./api/printer_diagnostic_handler.cpp
./api/staticcollectionmanagerimpl.h
./compiler/translator/module_version.h
./compiler/translator/module_version.cpp
./runtime/datetime/datetime_impl.cpp
./runtime/json/json_loader.h
./runtime/json/common.cpp
./runtime/json/json_impl.cpp
./runtime/json/jsonml_array.h
./runtime/json/snelson.cpp
./runtime/json/jsonml_array.cpp
./runtime/json/snelson.h
./runtime/json/common.h
./store/naive/json_items.cpp
./diagnostics/diagnostic_util.xq
./diagnostics/pregenerated/dict_en.cpp
./diagnostics/pregenerated/diagnostic_list.cpp
./diagnostics/pregenerated/dict_zed_keys.h

We should update all occurrences.

Assigned to Chris for priority and milestone setting.