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.
Minor spelling/clarification tweaks to multi-connection docs.
Renamed variables per discussion in j4mie/idiorm#15
Merge remote-tracking branch 'upstream/develop' into dev-multi. Updated documentation to rat format, and tests to use phpunit.

(Resolved)Conflicts:
	README.markdown
	idiorm.php
	test/test_queries.php
Apparently not all files were included in previous commit.
Merge remote-tracking branch 'tag/dev-multi' into multiple-connections
Merge branch 'develop' into multiple-connections

Conflicts:
	test/test_classes.php
	test/test_queries.php
Separate test for multiple connection caches
Remove duplicate code from test bootstrap
Normalise some code style
Fix multiple connection query caching
Remove obselete testing system
Multi-connections: Code style and docs
Add changelog for multiple connections