Add rever.xsh, news

Author: Andrew Yang

news/loaddata_headers.rst

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+**Added**
+- CI Coverage.
+- New tests for loadData function.
+- loadData function now toggleable. Can return either (a) data read from data blocks or (b) header
+information stored above the data block.
+
+**Removed**
+- Remove use of pkg_resources (deprecated).
+- No longer use Travis.

news/setup_rever.rst

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+***Added***
+- Compatibility with Python 3.10, 3.9, 3.8
+
+***Removed***
+- Remove the support for Python 3.5, 3.6.

news/support-py2-and-py3.rst

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+***Added***
+- Compatibility with Python 3.7, 3.6, 3.5 in addition to 2.7.
+
+***Changed***
+- Switch to platform-independent "noarch" Anaconda package.
+
+***Deprecated***
+- Variable `__gitsha__` in the `version` module which was renamed
+  to `__git_commit__`.

rever.xsh

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+$PROJECT = 'diffpy.utils'
+$ACTIVITIES = [
+              'tag',  # Creates a tag for the new version number
+              'push_tag',  # Pushes the tag up to the $TAG_REMOTE
+              'pypi',  # Sends the package to pypi
+              'ghrelease'  # Creates a Github release entry for the new tag
+               ]
+$PUSH_TAG_REMOTE = '[email protected]:diffpy/diffpy.utils.git'  # Repo to push tags to
+$GITHUB_ORG = 'diffpy'  # Github org for Github releases and conda-forge
+$GITHUB_REPO = 'diffpy.utils'  # Github repo for Github releases  and conda-forge
+$GHRELEASE_PREPEND = """See [CHANGELOG.md](CHANGELOG.md) for detailed release notes.
+
+The release is also available at [PyPI](https://pypi.org/project/diffpy.pdffit2/) and [Conda](https://anaconda.org/conda-forge/diffpy.pdffit2).
+"""  # release message