New example that shows C++11 support, build infrastructure for C++11

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+This example shows how to use ODB with C++11. In particular, this example
+examines ODB support for the new std::unique_ptr and std::shared_ptr smart
+pointers and their lazy variants as well as the unordered containers. It
+also shows how to use new C++11 features such as the range-based for-loop
+when working with persistent objects and handling query results.
+
+The example consists of the following files:
+
+employee.hxx
+  Header file defining the 'employee', 'employer', and 'pension_fund'
+  persistent classes. We use the standard std::shared_ptr/weak_ptr smart
+  pointers as well as their lazy versions provided by ODB to establish a
+  bidirectional employee-employer relationship. Because we don't share the
+  'pension_fund' objects, we use std::unique_ptr as an object pointer for
+  this persistent class. We also use the std::unordered_set container to
+  keep track of the employee's email addresses.
+
+employee-odb.hxx
+employee-odb.ixx
+employee-odb.cxx
+employee.sql
+  The first three files contain the database support code and the last file
+  contains the database schema for the employee.hxx header.
+
+  These files are generated by the ODB compiler from employee.hxx using the
+  following command line:
+
+  odb -d <database> -std c++11 --generate-schema --generate-query employee.hxx
+
+  Where <database> stands for the database system we are using, for example,
+  'mysql'.
+
+  The -std c++11 option is used to instruct the ODB compiler to compile in
+  the C++11 mode.
+
+database.hxx
+  Contains the create_database() function which instantiates the concrete
+  database class corresponding to the database system we are using. Unlike
+  other examples, here we use std::unique_ptr instead of std::auto_ptr to
+  return the created database.
+
+driver.cxx
+  Driver for the example. It includes the employee.hxx and employee-odb.hxx
+  headers to gain access to the persistent classes and their database support
+  code. It also includes database.hxx for the create_database() function
+  declaration.
+
+  In main() the driver first calls create_database() to obtain the database
+  instance. It then creates a number of 'employee', 'employer', and
+  'pension_fund' objects and persists them in the database. Then the driver
+  loads and prints some information about various objects and their
+  relationships. Finally, the driver performs a database query and iterates
+  over the result printing basic information about the returned objects.
+
+To run the example we may first need to create the database schema (for some
+database systems, such as SQLite, the schema is embedded into the generated
+code which makes this step unnecessary). Using MySQL as an example, this
+can be achieved with the following command:
+
+mysql --user=odb_test --database=odb_test < employee.sql
+
+Here we use 'odb_test' as the database login and also 'odb_test' as the
+database name.
+
+Once the database schema is ready, we can run the example (using MySQL as
+the database):
+
+./driver --user odb_test --database odb_test