Support for version script abi versioning

* Add BSON_1.0 and BSON_1.1 versions under the libbson-1.0.so.0 SONAME
* Configure check support as well
1.1.0-rc0 release

Signed-off-by: Jason Carey (hanumantmk) <jcarey@argv.me>
correctly attributing contributions
adding LIBBSON_1.* symbols to expected_abi
Merge branch 'mongodb-master'