removed using namespace std in DataArray.hpp
Merge pull request #235 from jgrewe/namespace

removed using namespace std in DataArray.hpp
[build] include vector, string in valid/results.hpp. Closes #237
[test] DataArray: Fix test for unit property (none condition)

This test will currently fail due to issue #233
[test] DataArray: Test for expansionOrigin (none condition)

This test will currently fail due to issues #233, #238, #239
DataArrayHDF5::unit: Fix getter for unit() [none case]

Should fix the DataArray::unit part of issue #233
DataArray::expansionOrigin: use correct backend function

Closes issue #238
DataArrayHDF5::expansionOrigin(none) use correct attribute

Use 'expansion_origin' not 'expansionOrigin'. Closes issue #239
DataArrayHDF5::expansionOrigin() fix none case in getter

This fixes DataArrayHDF5::expansionOrigin part of issue #233
Merge pull request #240 from gicmo/issue_233_238_239

DataArray optionals (expansionOrigin, unit) none case fixes
add support for units to DataTag
disallow "" as valid unit, must be given as "none"
moved docstring of unit sanitizer to util header
none unit testing, fixes
improve getOffsetAndCount to handle optional extents and units
add test case for valid and invalid units in DataTag
enable unit sanitizer during setting of units, added test