DataSet: replace ValueError with IndexError for invalid indices
DataSet: Add support for sliced indexing (reading data)
[test] Add new tests for DataSet's new sliced indexed reading
DataSet: extract index -> tuple logic into __index_to_tuple

We will reuse this then for __setitem__
DataSet.__index_to_tuple: integrate Ellipsis condition
DataSet: Add support for indexed writing of data
[test] DataSet: add tests for indexed writing of data

Don't need to test too much because most of the index -> count,
offset testing is done in the read test cases.
DataSet: Add __len__ and len() that behave like numpy
[test] Test for DataSet's __len__ method
DataSet: Add size property with the semantics like numpy
[test] DataSet: add test for size property
Merge pull request #38 from gicmo/dataset_index_read

Dataset: Add support for indexed reading and writing

Very nice, and thanks for the good explanations in the code, helped me allot.
Doc: documentation for find methods
[doc] Enable intersphinx and add mapping for py2.7 + numpy
[doc] DataArray/DataSet: add docs for various missing items
Merge pull request #39 from gicmo/doc_dataarray

Add docs for various DataArray, DataSet items

The documentator strikes again!
DataArray: create_data: accept array-like data not only ndarray
Merge pull request #40 from gicmo/create_data_array_like

DataArray: create_data: accept array-like data not only ndarray

Thanks
Merge pull request #41 from stoewer/master

Doc: documentation for find methods

Hodor, hodor, hodor!
[docs] Use 'alabaster' theme instead of default

For the looks!!