feat(*): add environment variable and random functions

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+# CHANGELOG
+
+## Versioning
+
+This library is versioned based on Semantic Versioning ([SemVer](https://semver.org/)).
+
+#### Version scoping
+
+The scope of what is covered by the version number excludes:
+
+- error messages; the text of the messages can change, unless specifically documented.
+
+#### Releasing new versions
+
+- create a release branch
+- update the changelog below
+- update version and copyright-years in `./LICENSE.md` and `./src/time.c` (in module constants)
+- create a new rockspec and update the version inside the new rockspec:<br/>
+  `cp luasystem-scm-0.rockspec ./rockspecs/luasystem-X.Y.Z-1.rockspec`
+- clean and render the docs: run `ldoc .`
+- commit the changes as `Release vX.Y.Z`
+- push the commit, and create a release PR
+- after merging tag the release commit with `vX.Y.Z`
+- upload to LuaRocks:<br/>
+  `luarocks upload ./rockspecs/luasystem-X.Y.Z-1.rockspec --api-key=ABCDEFGH`
+- test the newly created rock:<br/>
+  `luarocks install luasystem`
+
+## Version history
+
+### Version X.Y.Z, unreleased
+
+- Feat: on Windows `sleep` now has a precision parameter
+- Feat: `setenv` added to set environment variables.
+- Feat: `getenvs` added to list environment variables.
+- Feat: `getenv` added to get environment variable previously set (Windows).
+- Feat: `random` added to return high-quality random bytes
+- Feat: `isatty` added to check if a file-handle is a tty
+
+### Version 0.2.1, released 02-Oct-2016
+
+### Version 0.2.0, released 08-May-2016
+
+### Version 0.1.1, released 10-Apr-2016
+
+### Version 0.1.0, released 11-Feb-2016
+
+- initial release