Arus

arus_demo_v1.0.1
See [README](https://github.com/qutang/arus/tree/master/apps/arus_demo) for instructions.

Feature
* Provide previous input and output in the processor (2a50b107617dba7fecd73d00cf56501aa37c8b94)
* Use `None` for previous window st and et for the first window of the stream (6013a739ae4c3256a7b8d5af598f3b226fb2c121)
* Pipeline output has the same tuple structure as streams, close 59 (aca5f345233689c43f4ef7730568493221c4e566)
* Output includes current and previous window boundaries, name, and data for stream (d2a32c3db03094bef5676bff4163bb4d4f06c1bc)
* Add `generator` function for annotations (502c4355d814dc1b7090824fc4b4622c8435a727)

Fix
* Fix racing bug when shutting down the pipeline (b40c09c79cacd92a38d98ebe31e4952740658ebd)
* Remove `sr` from the argument list of `GeneratorSlidingWindowStream` class (d9ff23b781b20aed5104e47f11e18a109135f960)
* return empty chunks if the loaded data is empty for `SlidingWindowStream` (e4908962f9f01b09038e46ed7ec946fcd910b53e)
* update `Pipeline` class to meet the changes in `Stream` class (6c14f052e8e45724a988ab5de72494c9233c674f)
* use float microseconds when generating timestamps for sensor data (ee9d008c956f04adbceaf6750701135a31f1d84b)

Documentation
* Ignore unit tests (dcbf92d53f099c32e701149f730b085b23433074)
* Fix example reference links (a428429a6f7be4d727f9322f87fe956bcf752ffa)
* fix syntax in docs (ea53386a7d1ddff21ff84687dd8cc5d31c4162a2)

Feature
* Support threads scheduler in pipeline (b13094b70cccaa954d3cab2ba2a530e68855c0f7)
* add "max_processes" to the pipeline constructor to set the maximum processes to be used (cdfb092113e27f4ed15086947f9a7e7e951b47f2)
* `Pipeline` class now works for multiple streams (bbe891eee7770a2ceb169bc3ec8172fbb3af1dc7)
* Add `SensorGeneratorStream` class to support streaming randomly generated accelerometer data (5e6c308125b78c590e08227778c06ab93a793e22)
* add function to generate random accelerometer data with normal distribution (071216fe42f90b8f01a960468f901f6f2985d5b6)
* add new features (662919b4aed439dff0b20638db7651d395205a52)
* implement pipeline base class (in-dev) (9834ca6a5ecfb7b8e2e1acd246ffbfc83c22f389)
* the output from `SensorFileStream` and `AnnotationFileStream` class includes meta data (9b82fb0a877f70d4eda43a6a2c373fa1c3fd0c6a)
* support `exception_type` of "missing" for mhealth sensor test data (8f10c05bcf326ba4e2dafeca4df0d40683804171)

Fix
* Quit `SensorGeneratorStream` when `stop` is called normally (1fedf65f3f384ceeb6ccd86cb6ddcaf192e252c5)
* syntax error in pipeline.py (9377c3ebbd82c46bc48467270367b718e3d03b92)
* fix actigraph sensor test data storage structure (77c4c5ae299702562d5a5549f7298ee0a9a0d6f6)

Breaking
* pipeline supports multiple streams and uses `set_processor` to set custom function to process stream chunks. (bbe891eee7770a2ceb169bc3ec8172fbb3af1dc7)
* Add `SensorGeneratorStream` class to support streaming randomly generated accelerometer data (5e6c308125b78c590e08227778c06ab93a793e22)
* Add features skew, correlation, kurtosis, spectral_entropy (662919b4aed439dff0b20638db7651d395205a52)

Documentation
* add documentations to pipeline file (b3eae4afc1372b9ef8cf737b3850d102ca6cddf1)
* add doc strings to pipeline, stream, and testing files (f5632e3c8a533f899b9c750c1639135b75d1c893)
* update README to include a new plugin package `arus-components-hci` (e11667e6fab086bee6ffa0ffa781677fd7e3add0)

Fix
* return a chunk with "Unknown" annotation if no annotation rows are found for a chunk (0419a7faaac8463ba8fc3464fb6ea557b71c71f8)