localize parseStreetAddress for en_CA, fr_CA; fix bug; add unit testing

Currently the CRM/Core/BAO/Address.php parseStreetAddress function support just US civic address formats.

This patch provides support for putting units at the beginning of the address, in conformity with Canadian addressing formats:
2-123 Main St

It also supports the Canadian French habit of putting a comma after the street number (and suffix) and before the street type:
123, rue Principale

Finally there was a small bug that resulted in street_number_suffix being returned with a zero-length string in some cases rather than a Null value.

Also attached are PHPUnit tests for this function. Note that I ran the tests using the parseStreetAddressTest.php file. I cut and pasted its functions into the AddressTest.php file (patch attached) but haven't tested that setup.