add 1.1.7 release to NEWS on 1.2.0-dev
add 1.1.7 release to NEWS on 1.2.0-dev

paulmelnikow/libbson,paulmelnikow/libbson,alexeyvo/libbson,Convey-Compliance/libbson,bjori/libbson,ajdavis/libbson,ajdavis/libbson,mongodb/libbson,alexeyvo/libbson,bjori/libbson,rcsanchez97/libbson,rcsanchez97/libbson,mongodb/libbson,bjori/libbson,mongodb/libbson,Machyne/libbson,rcsanchez97/libbson,mapr/libbson,Convey-Compliance/libbson,ksuarz/libbson,Machyne/libbson,ksuarz/libbson,paulmelnikow/libbson,Machyne/libbson,alexeyvo/libbson,paulmelnikow/libbson,Machyne/libbson,ksuarz/libbson,mapr/libbson,mapr/libbson,paulmelnikow/libbson,Convey-Compliance/libbson,ajdavis/libbson