* Update issue templates, thanks @explosion for the inspiration.

Direct support questions to StackOverflow instead.

* Remove stale issue templates.

* Update ---bug-report.md

* Update ---documentation.md

* Update about.py

* Update add.py

* Update update.py

Some packages (like `pygame-music-grid`) have unparseable metadata.
This resulted in a ValueError. pip ignores packages like these, so it's reasonable
to do the same in poetry itself and only display the well-formed ones.

Fixes #1345.
Fixes #637.

This reverts commit be03ab9e.

This reverts commit 0b38fada.

* fix METADATA generation for git dependencies with extras

* add comment

* add comment

* add comment and linting

* Move trailing space from `base_pep_508_name()` to `to_pep_508()`

* Merge remote-tracking branch 'origin/master'

# Conflicts:
#	tests/packages/test_vcs_dependency.py

* Make changes python2 compliant

* Handle any type of marker

* Insert space before semicolon in dependency.py if vcs

* Setup basic Github actions

* Remove Travis and Appveyor config files

* Update pre-commit configuration

remove --> uninstall

doc: fix some typos

- Add missing ".py" for file structure
- Fix slash for Windows path
- Fix word case to match other titles

950 simplified

Building upon patch from [#1299][1]

[1]: https://github.com/sdispater/poetry/pull/1299/commits

Co-authored-by: David Hotham <david.hotham@metaswitch.com>

Fixes cases where the version part of the wheel file name would become

`0.1b1_gitbranch.buildno.1`

instead of

`0.1b1+gitbranch.buildno.1`

Fixes sdispater/poetry#756

fix typo in doc site

Fixes bug on Python 2.7, introduced in #1088

Some programs (ex. Emacs with auto-virtualenvwrapper package) uses
.venv file to auto-determine the virtualenv of the project. Which is
pretty handy. As well as, it doesn't make sense inside a poetry to
try to set the venv, when it is a file.

* Use subprocess.run() to properly capture return codes.
Fixes #1074

* replaced capture_output flag - only available on 3.7

* Ensure the backported CalledProcessError is imported.

* Fix env tests on windows.

* Format and comment fixes

* Fix encoding for files created for building package (issue #1027)

This is minimal set of modifications, which fixed the problem.

There are still more places, where files are open in text mode
without explicit encoding, thus possibly failing on systems not using
UTF-8 console encoding.

* test_api.py use explicit encoding for files.

* get-poetry.py: fix explicit (utf-8) encoding for files open in text mode

* tests: fix explicit (utf-8) encoding for files open in text mode

* poetry init: use explicit utf-8 for created pyproject.toml

* installed: use explicit utf-8 for text files

* layouts: use explicit utf-8 for open text files

* spdx: explicit utf-8 for open text files

* pypi_repository: explicit utf-8 for open text files

* explicit utf-8 for json

* explicit utf-8 for metadata

* explicit utf-8 for requires.txt

* open files with explicit encoding in py27

* fix creation of poetry.bat on Windows

* Make get-poetry.py compatible to py2/3

* Blacked two files to pass linter test

* remove extranous encoding related comments

* rewert broken move of import related to ansible

* removed extraneous comments about opening files in UTF-8

* rewert ansible.release import (keep order of vars unchanged)

* Revert to original content (as it comes from external project)

* all vendored setup.py files in fixtures reverted back to org

Resolves: #1162

`poetry build` creates a whl file using `os.mkstemp`. The file is
created with very restrictive permissions. This commit ensures these are
normalized before the build starts.

Partly addresses https://github.com/sdispater/poetry/issues/671.