Add support for tabular array data.
Some fixes to table support examples and text.
First pass at inline array data
Merge pull request #6 from mdboom/tables

Table support
Merge pull request #17 from mdboom/inline-data

Inline data
Minor changes to support masking
Merge pull request #19 from spacetelescope/masking

Minor changes to support masking
Add support for string data types
Merge pull request #18 from spacetelescope/string-types

Add support for string data types
First pass at inline array data
First draft of generalized WCS standard.
Rename input_ to image_ and output_ to world_