Fixed query logging for delete_many; added unit test for delete_many
Add raw_execute() to ORM
Multiple connection support for Idiorm

Mutiple connections code, including documentation and unit tests.
Utilizes key names to distinguish connections, but uses a default
connection if none specified. I don't (yet) use multiple connections in
my work (it's pending), so this has not been tested "in the wild".

Added unit tests with additional connections, ran unit tests for Paris
against this build too, so an unmodified Paris is forward-compatible
with this commit (mulitple connections support not yet coded for Paris).

Does *NOT* add support for queries across multiple connections. (I
don't even want to go there ...)

##### Edge-case compatibility breaks:

* ORM::_setup_identifier_quote_character visibility was changed to
protected (which was likely original intent, judging by prefixed name)

* May break compatibility if ORM has been extended, **and** subclasses
directly utilize `::_config`, `::_db`, `::_query_log`, or
`::_query_cache` instead of using pre-existing accessor methods. (Paris
does not do this; all Paris tests pass)

* Re-use of `Tester` class outside of Idiorm repo, as
`Tester::check_equal()` was renamed to `Tester::check_equal_query()`

##### Other notes
New method: `ORM::get_connection_keys()`.
New `Tester` method: `Tester::check_equal_string()`.

TODO: Consider adding methods to get (connection-specific)
configuration info.
Fixed query logging for delete_many; added unit test for delete_many
Add raw_execute() to ORM
Add in release notes for pull requests
Minor spelling/clarification tweaks to multi-connection docs.
Begin sphinx based documentation
Closes issue #85 Implement is_new() in Idiorm
Correct spelling error in documentation
Merge branch 'master' into develop

Conflicts:
	README.markdown
Move config, installation & philosophy into Sphinx
Issue #81 Move documentation out of one massive readme file
Merge branch 'sphinxdocs' into develop

Conflicts:
	README.markdown
Forgot to mention new documentation build procedures and location
Fix last insert ID not being returned with postgresql, take 2.
Add access to PDOStatement via get_last_statement
Add changelog for get_last_statement
Add test for get_last_statement
Change code to use get_last_statement