DbEnvironmentFactory - now can create new concrete db environment instances.
(TODO: route db environment instantiations to it)
DatabaseEnvironment fixture delegates new db env to DbEnvironmentFactory
Static helper factory method added to DbEnvironmentFactory
OracleTest delegates environment creation to factory
Moved db environment instantiation test from oracle to core
TeradataTest delegates env instantiation to DbEnvironmentFactory
Added check for jdbc driver class before instantiating db env
MySqlTest delegates env instantiation to factory
SqlServerTest migrated to factory db env initialization
DB2 migrated to factory db env instance creation
DerbyTest migrated to factory db env instantiation
PostgresTest migrated to factory db env instantiation
HSQLDBTest migrated to factory db env instantiation
Added driverClassName parameter to all db environment constructors.
Db environment registration implemented via annotations.
Evo Class Index dependency added for traversal of annotated classes
(http://www.atteo.org/evo-framework/class-index)
Db env instantiation moved to EnvironmentDescriptor
Commented evo-classindex dependency (@jar suffix is removed for purpose)
#27: improved error msg when JDBC driver missing
Merge pull request #75 from benilovj/improve-error-message-when-missing-jdbc-driver-issue-27

Improve error message when missing jdbc driver (issue #27)
bugfix: github.com => github.io