Pass zero offset to storeFileFromOffset

SMBConnection.storeFile() calls storeFileFromOffset() following commit
e381b0e743acd416509171cc4417c6ac23a2f472.  However, the commit did not
include passing a zero offset, so the timeout was being passed as the
offset.
Merge pull request #12 from smartfile/storefile-fix

Pass zero offset to storeFileFromOffset