update 1.4 branch with prefetch fix and global options loading
activate fadvise_willneed and write_threads options
add iterators.erl file that test mv-iterator-prev code.  update build_deps.sh
Merge pull request #77 from Licenser/patch-1

fixed dialyzer errors in async_iterator_move
Add defensive check of arity on all option parser usage of enif_get_tuple().  Will add same in other routines later.
missed some conflicts.
point build_deps to leveldb equivalent branch
Schema updates for new cuttlefish API. unit test.
Makefile fixe
Merge pull request #87 from basho/jd-cuttlefish-api

Schema updates for new cuttlefish API. unit test.
merge of develop and mv-fadvise-control-2.0
multi_backend stuff needed advanced flag
initial coding of iterator_refresh, unit tests pass ... moving to bigger machine.
bugs fixed.  works.  but probably not fully thread safe.  needs rework.
isolated and fixed segfault issue.  ready to go into full test.
oops ... left a line of testing code active.  now gone.
Merge pull request #88 from basho/mv-iterator-refresh

Mv iterator refresh
Fix leveldb version to develop branch
LevelDB schema updates by confbal. Happy New Year!
Interleaved multi_backend settings so they're nearby

* also made sure multi settings matched their single counterpart