Updated CI cfg (ParallelSSH#180)

Updated CI cfg (ParallelSSH#180)

Libssh2 upg (ParallelSSH#179)

* Upgraded libssh2 to 1.10.0.
* Regenerated with latest cython.
* Updated docker files for new libssh2 and openssl versions. Removed obsolete file.
* Updated readthedocs config.
* Updated setup.py, CI cfgs, CI scripts.
* Updated Changelog.

Source update (ParallelSSH#162)

* Removed support for libssh2<1.7.
* Removed native package scripts for obsolete libssh2 versions.
* Removed conda recipe.
* Moved find_eol files to ext
* Updated setup
* Updated gitignore.
* Check for session dealloc before deallocating agent.
* Updated sources
* Updated circle CI.
* Removed obsolete CI files.
* Added manylinux-2014 wheel builds for x86_64.
* Updated changelog
* Updated CI cfg

Enable fileinfo attributes on windows (ParallelSSH#142)

* Enable fileinfo and statinfo attributes on windows
* Updated changelog

Method pref (ParallelSSH#140)

* Added new libssh2 1.9.0 error codes as exceptions.
* Added session method and supported algorithm functions - resolves ParallelSSH#128
* Updated changelog
* Updated documentation

Updated documentation (ParallelSSH#139)

Sftp attrs (ParallelSSH#124)

* Minor fixes for kdb int
* Added SFTP attribute flags. Updated sftp tests - resolves ParallelSSH#119
* Updated change log

Circleci (ParallelSSH#116)

* Added circleci config. Updated travis cfg

Manifest (ParallelSSH#115)

* Updated travis cfg
* Updated manifest