Splice in project template

I tried to merge it so that future updates from the template will be
much easier.

The template is hosted at:
https://github.com/ethereum/ethereum-python-project-template

.gitignore

@@ -1,57 +1,133 @@
 # Byte-compiled / optimized / DLL files
-__pycache__/
 *.py[cod]
+__pycache__/
 *$py.class
 
 # C extensions
 *.so
 
 # Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-*.egg-info/
-.installed.cfg
 *.egg
+*.egg-info
+dist
+build
+eggs
+.eggs
+parts
+bin
+var
+sdist
+develop-eggs
+.installed.cfg
+lib
+lib64
+venv*
+.Python
+downloads/
+wheels/
 MANIFEST
 pip-wheel-metadata
 
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
 # Installer logs
 pip-log.txt
 pip-delete-this-directory.txt
 
 # Unit test / coverage reports
-htmlcov/
-.tox/
 .coverage
-.coverage.*
-.cache
+.tox
 nosetests.xml
+htmlcov/
+.coverage.*
 coverage.xml
 *.cover
-.hypothesis/
 .pytest_cache/
 
 # Translations
 *.mo
 *.pot
 
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Complexity
+output/*.html
+output/*/index.html
+
+# Sphinx
+docs/_build
+docs/modules.rst
+docs/*.internal.rst
+docs/*._utils.*
+
+# Hypothese Property base testing
+.hypothesis
+
+# tox/pytest cache
+.cache
+
+# Test output logs
+logs
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/dictionaries
+.idea/vcs.xml
+.idea/jsLibraryMappings.xml
+
+# Sensitive or high-churn files:
+.idea/dataSources.ids
+.idea/dataSources.xml
+.idea/dataSources.local.xml
+.idea/sqlDataSources.xml
+.idea/dynamic.xml
+.idea/uiDesigner.xml
+
+# Gradle:
+.idea/gradle.xml
+.idea/libraries
+
+# Mongo Explorer plugin:
+.idea/mongoSettings.xml
+
+# VIM temp files
+*.sw[op]
+
+# mypy
+.mypy_cache
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
 # Django stuff:
 *.log
 local_settings.py
@@ -64,9 +140,6 @@ instance/
 # Scrapy stuff:
 .scrapy
 
-# Sphinx documentation
-docs/_build/
-
 # PyBuilder
 target/
 
@@ -86,10 +159,8 @@ celerybeat-schedule
 .env
 .venv
 env/
-venv/
 ENV/
 env.bak/
-venv.bak/
 
 # Spyder project settings
 .spyderproject
@@ -101,11 +172,5 @@ venv.bak/
 # mkdocs documentation
 /site
 
-# mypy
-.mypy_cache/
-
-# pycharm
-.idea/
-
 # vscode
 .vscode/