Makefile: configure compilation flags properly
Makefile: move the testdb to /tmp or it won't mmap in Vagrant
README.md: more explanation on jemalloc usage
Makefile: add compilation of je_utils.c
Makefile: compile liblmdb.a w/ je_utils.c
Makefile: compile liblmdb.so w/ je_utils.c
mdb.c: add jemalloc headers
mdb.c: replace all malloc with je_malloc
mdb.c: replace all free with je_free
mdb.c: replace all calloc with je_calloc, and strdup with je_strdup
mdb_dump.c: add jemalloc headers
mdb_dump.c: replace all malloc with je_malloc
mdb_dump.c: replace all free with je_free
mdb_load.c: include jemalloc headers
mdb_load.c: replace free with je_free, strdup with je_strdup
mdb_load.c: replace realloc with je_realloc
mdb_load.c: replace strdup with je_strdup
mdb_load.c: replace malloc with je_malloc
mdb_stat.c: include jemalloc headers
mdb_stat.c: replace malloc with je_malloc