Py3270

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- Add Windows support, but not tested thoroughly.Consider Windows supportExperimental.
- use x3270 executables from PATH instead of requiring ExamBase to be subclassed
- fix buffering problems when writing to x3270 subprocess

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- changed default timeout to 30 seconds
- added send_pf7(), send_pf8()

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- added is_connected() method

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- had messed up a previous upload to pypi releasing a fixed 0.1.1 as 0.1.2, so
need to go to next version number

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- fix data parsing on Windows

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- renamed Emulator to EmulatorBase to make it clearer that a subclass is needed
- adjusted readme