Move license and changelog to separated files. Improve docstring format

CHANGELOG.md

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+# CHANGELOG
+
+## 0.12.0 (2018-01-08)
+- Add Python 3 support [#42](https://github.com/sebdah/scrapy-mongodb/issues/42)
+
+## 0.11.0 (2017-08-09)
+- Do not store `None` or empty value objects in MongoDB [#39](https://github.com/sebdah/scrapy-mongodb/issues/39)
+- Fix memory leak [#38](https://github.com/sebdah/scrapy-mongodb/issues/38)
+- Fix bug in logging [#40](https://github.com/sebdah/scrapy-mongodb/issues/40)
+
+## 0.10.0 (2017-08-03)
+- Store items from different spiders in different collections [#36](https://github.com/sebdah/scrapy-mongodb/pull/36)
+- Fix a number of deprecation warnings [#34](https://github.com/sebdah/scrapy-mongodb/issues/34)
+- Update `scrapy` version to 1.4.0
+
+## 0.9.1 (2015-12-18)
+- Fix typo
+
+## 0.9.0 (2015-04-10)
+- [#28 Allow per-spider configuration](https://github.com/sebdah/scrapy-mongodb/pull/28). Thanks [@thiagof](https://github.com/thiagof) for the pull request
+
+## 0.8.2 (2015-03-11)
+- [#26 Unicode log message](https://github.com/sebdah/scrapy-mongodb/issue/26). Thanks [@italomaia](https://github.com/italomaia) for the pull request
+
+## 0.8.1 (2015-03-05)
+- [#25 Add unicode shebang](https://github.com/sebdah/scrapy-mongodb/pull/25). Thanks [@italomaia](https://github.com/italomaia) for the pull request
+
+## 0.8.0 (2014-12-25)
+- [#22 Call serializer before inserting](https://github.com/sebdah/scrapy-mongodb/issue/22). Thanks [@italomaia](https://github.com/italomaia) for the pull request
+
+## 0.7.2 (2014-08-11)
+- [#18 Enable multiple value index for collection](https://github.com/sebdah/scrapy-mongodb/pull/18). Thanks [@sherzberg](https://github.com/sherzberg) for the pull request
+
+## 0.7.1 (2014-04-14)
+- Fixed bad log messages when duplicate keys were found
+
+## 0.7.0 (2014-04-07)
+- [#13 Add option to allow closing the spider upon duplicate insertion in mongodb](https://github.com/sebdah/scrapy-mongodb/pull/13)
+
+## 0.6.4 (2014-04-07)
+- Add the MONGODB_STOP_ON_DUPLICATE option which allows to close the spider when a certain amount of duplicated insertion threshold is reached.
+
+## 0.6.3 (2014-03-24)
+- Syncing all items not previously synced from the local buffer to MongoDB when the spider finishes
+
+## 0.6.2 (2013-08-23)
+- [#10 get_project_settings precludes configuring settings on command line](https://github.com/sebdah/scrapy-mongodb/pull/10)
+
+## 0.6.1 (2013-07-14)
+- [#9 fix: item_buffer.append() takes exactly one argument (0 given)](https://github.com/sebdah/scrapy-mongodb/pull/9)
+
+## 0.6.0 (2013-06-04)
+- [#6 ScrapyDeprecationWarning: crawler.settings](https://github.com/sebdah/scrapy-mongodb/issues/6)
+- [#7 Use Python format() for output](https://github.com/sebdah/scrapy-mongodb/issues/7)
+- [#8 Bug when upserting items with a unique key](https://github.com/sebdah/scrapy-mongodb/issues/8)
+
+## 0.5.1 (2013-06-03)
+- Updated docstrings
+
+## 0.5.0 (2013-01-10)
+- Implemented feature [#5 Add flag for setting timestamps in the database](https://github.com/sebdah/scrapy-mongodb/issues/5)
+- Implemented feature [#4 Implement support for MongoDB authentication](https://github.com/sebdah/scrapy-mongodb/issues/4)
+- Implemented feature [#3 Add support for MongoDB URIs when connecting](https://github.com/sebdah/scrapy-mongodb/issues/3)
+- Implemented feature [#2 Support buffered data](https://github.com/sebdah/scrapy-mongodb/issues/2)
+
+## 0.4.0 (2013-01-07)
+- Added support for MongoDB replica set host strings
+
+## 0.3.0 (2013-01-06)
+- Minor supportive updates
+
+## 0.2.0 (2013-01-06)
+- Fixed connection problem for MongoDB replica sets
+- Fixed bad default parameter handling
+
+## 0.1.0 (2013-01-06)
+- Initial release of the `scrapy-mongodb` pipeline module
+- Support for MongoDB replica sets and standalone databases

LICENSE

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+scrapy-mongodb - MongoDB pipeline for Scrapy
+
+Homepage: https://github.com/sebdah/scrapy-mongodb
+Author: Sebastian Dahlgren <sebastian.dahlgren@gmail.com>
+License: Apache License 2.0 <http://www.apache.org/licenses/LICENSE-2.0.html>
+
+Copyright 2013-2018 Sebastian Dahlgren
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.