Add Boost profile example

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+This example shows how to persist objects that use Boost smart pointers,
+containers, and value types with the help of the Boost profile library
+(libodb-boost).
+
+The example consists of the following files:
+
+employee.hxx
+  Header file defining the 'employee' and 'employer' persistent classes.
+  We use shared_ptr/weak_ptr smart pointers provided by Boost (as well
+  as their lazy versions provided by the Boost profile library) to
+  establish a bidirectional employee-employer relationship. We also use
+  the boost::gregorian::date type to store the employee's date of birth.
+  Finally, we use the boost::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> -p boost --generate-schema --generate-query employee.hxx
+
+  Where <database> stands for the database system we are using, for example,
+  'mysql'.
+
+  The -p option is used to instruct the ODB compiler to load the Boost
+  profile.
+
+database.hxx
+  Contains the create_database() function which instantiates the concrete
+  database class corresponding to the database system we are using.
+
+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' and 'employer' objects and
+  persists them in the database. The next transaction loads all the employees
+  of a particular employer using the employee-employer relationship. Finally,
+  the driver performs a database query which uses a data member of the Boost 
+  gregorian::date type in its criterion.
+
+To run the example we first need to create the database schema. 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