CDRIVER-200 Memory scribble in 'bson_append' when level of nested objects exceeds 32
CDRIVER-200 _bson_append_grow_stack now doubles stack size, initially uses struct-local fixed-sized stack to avoid initial malloc
Merge pull request #84 from jbrd/master

CDRIVER-200 Memory scribble in 'bson_append' when level of nested objects exceeds 32