fixing test_dtype
Merge pull request #2 from teravest/daniels290

fixing test_dtype
fixing test_shape
Merge pull request #3 from teravest/daniels290

fixing test_shape
TST: Fix tests for _to_dense
Merge branch 'issue-290' of github.com:wasade/biom-format into issue-290
TST: Fix get_row tests

The test was failing because the initializing values were not sparse
objects.