add auto discover support for AS/400 with jndi
add dialect documentation
add current_schema to as400 jndi connection
Merge pull request #391 from pierrickrouxel/master

Add AS/400 current_schema support to jndi connection
rake tasks support for 4.0 while still supporting previous versions as well
refactored rake testing support
correct rake task behaviour on 3.x + do not redefine tasks unless necessary
refactor (simplify) AR-4.0 rake taks monkey-patches
make sure :load_config is a prerequisity for the  db:test:purge task
oracle's recreate_database does not really recreate the database - remove
date issue still present on  latest stable (1.7.4)
due removed ThreadContext.createCallerBacktrace we need to re-invent it
using reflection - provides us and maintains  JRuby 1.6.8 - 1.7.4 compatibility
avoid 1.7.4 deprecated org.jruby.javasupport.util.RuntimeHelpers
tune adapter jar's manifest attributes
update pom.xml for IDEs - using Java 1.6 (still against jruby-complete 1.6.8)
update jdbc generator - add a few notes that it is only needed on Rails 2.3
[sqlite3] missing adapter.encoding method
[sqlite3] missing adapter.encoding method + rake tests
some more/updated mysql rake tests
postgres should establish_connection on  db:structure:dump + rake tests