update README with stream parse support
set default padding of cells to true for each_row_streaming and cleanup cell_count logic
fix logic error, revert to if pad_cells is not in options then set default to true
drop non-useful comment
adding in tests for default padding (and a test to make sure padding works). rspec breaks on tyhpheous gem -- comment out in spec_helper to get excelx spec to run
Merge pull request #2 from rlburkes/doc_and_defaults

Doc and defaults