Knitter

- Support Python 3.5 and plus. Python 2.7 is deprecated.

- Deprecated the multi-threading feature.

- Rewrote all implementations of executor and configure.

- Updated HTML report.

- Updated WebElement methods to support the latest selenium.

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+ Fixed bugs.

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+ Fixed command line running error issue.

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+ Added new operations in WebElement.

+ Bug fix.

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+ Added wingui.py to support upload/download dialog on MS Windows System. (Need install "SendKeys" and "PyWin32" manually)

+ Added support for multi-window operations.

+ Updated alert handling.

+ Fix bugs of datadriver and webelement operations.

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+ Bug fix

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