Resolves: #1401

* Use os.execvp for poetry run

* Use subprocess.Popen for Windows

* Handle env kwargs

* Fix specification of Python versions for dependencies using double
  pipe (`||`) instead of using an array which leads to confusion (see for
  instance https://github.com/sdispater/poetry/issues/847).

* Fixes #847

Signed-off-by: mr.Shu <mr@shu.io>

Resolves: #1080

Closes: #1303

* 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.

- apply the PyCharm "optimize imports"
- place functions above fixtures
- alphabetize fixture functions
- remove duplicate tmp_dir fixture

This change fixes the installation of packages using a url source.
Previously, the installer attempted to install the package using the
name ignoring the source url.

* 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

Catch and deal with failed symlinking on Windows