-Added mutex lock for the InitIO() call.
forgot to make the mutex a static varible
Merge pull request #61 from sosh/master

Added mutex lock for the InitIO() call
SparseField updates for v1.4
Bumping version to 1.4.0
Updating .so version to v1.4.0
Set soversion automatically instead of manually.
Merge pull request #66 from hobbes1069/master

Set soversion automatically instead of manually.
Adding boost_system-mt
Library performance test suite.