Aws-xray-sdk

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* feature: Added support for `psycopg2`. `PR83 <https://github.com/aws/aws-xray-sdk-python/pull/83>`_.
* feature: Added support for `pynamodb` >= 3.3.1. `PR88 <https://github.com/aws/aws-xray-sdk-python/pull/88>`_.
* improvement: Improved stack trace recording when exception is thrown in decorators. `PR70 <https://github.com/aws/aws-xray-sdk-python/pull/70>`_.
* bugfix: Argument `sampling_req` in LocalSampler `should_trace` method now becomes optional. `PR89 <https://github.com/aws/aws-xray-sdk-python/pull/89>`_.
* bugfix: Fixed a wrong test setup and leftover poller threads in recorder unit test.

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* bugfix: Fixed a issue where manually `begin_segment` might break when making sampling decisions. `PR82 <https://github.com/aws/aws-xray-sdk-python/pull/82>`_.

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* **Breaking**: The default sampler now launches background tasks to poll sampling rules from X-Ray backend. See the new default sampling strategy in more details here: https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-python-configuration.html#xray-sdk-python-configuration-sampling.
* **Breaking**: The `should_trace` function in the sampler now takes a dictionary for sampling rule matching.
* **Breaking**: The original sampling modules for local defined rules are moved from `models.sampling` to `models.sampling.local`.
* **Breaking**: The default behavior of `patch_all` changed to selectively patches libraries to avoid double patching. You can use `patch_all(double_patch=True)` to force it to patch ALL supported libraries. See more details on `ISSUE63 <https://github.com/aws/aws-xray-sdk-python/issues/63>`_
* **Breaking**: The latest `botocore` that has new X-Ray service API `GetSamplingRules` and `GetSamplingTargets` are required.
* **Breaking**: Version 2.x doesn't support pynamodb and aiobotocore as it requires botocore >= 1.11.3 which isn’t currently supported by the pynamodb and aiobotocore libraries. Please continue to use version 1.x if you’re using pynamodb or aiobotocore until those haven been updated to use botocore > = 1.11.3.
* feature: Environment variable `AWS_XRAY_DAEMON_ADDRESS` now takes an additional notation in `tcp:127.0.0.1:2000 udp:127.0.0.2:2001` to set TCP and UDP destination separately. By default it assumes a X-Ray daemon listening to both UDP and TCP traffic on `127.0.0.1:2000`.
* feature: Added MongoDB python client support. `PR65 <https://github.com/aws/aws-xray-sdk-python/pull/65>`_.
* bugfix: Support binding connection in sqlalchemy as well as engine. `PR78 <https://github.com/aws/aws-xray-sdk-python/pull/78>`_.
* bugfix: Flask middleware safe request teardown. `ISSUE75 <https://github.com/aws/aws-xray-sdk-python/issues/75>`_.

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* bugfix: Fixed an issue on PynamoDB patcher where the capture didn't handle client timeout.

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* bugfix: Handle Aiohttp Exceptions as valid responses `PR59 <https://github.com/aws/aws-xray-sdk-python/pull/59>`_.

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* feature: Added Sqlalchemy parameterized query capture. `PR34 <https://github.com/aws/aws-xray-sdk-python/pull/34>`_
* bugfix: Allow standalone sqlalchemy integrations without flask_sqlalchemy. `PR53 <https://github.com/aws/aws-xray-sdk-python/pull/53>`_
* bugfix: Give up aiohttp client tracing when there is no open segment and LOG_ERROR is configured. `PR58 <https://github.com/aws/aws-xray-sdk-python/pull/58>`_
* bugfix: Handle missing subsegment when rendering a Django template. `PR54 <https://github.com/aws/aws-xray-sdk-python/pull/54>`_
* Typo fixes on comments and docs.