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**Added:**
* `integrate` allows user to supply their own mask
* Add `transform` cli, a simple interface to transform the .chi file to PDF.
* Tutorials for users to use the tools in `pdfstream`.
* `integrate` and `transform` will create the output folder if it does not exists.
**Changed:**
* `load_data` is vended from diffpy. `load_array` accepts `min_rows` and key word arguments.
* `write_out` is renamed to `write_pdfgetter`.
* All the code using `diffpy.pdfgetx` is in the transformation subpackage. Users can choose whether to install the diffpy.pdfgetx.
**Removed:**
* IMPORTANT: modeling, parsers, calibration sub-packages are removed.
* IMPORTANT: remove the dependency on xpdtools