Version 1.2

Latest stable release available from PyPi:
https://pypi.python.org/pypi/esptool/

This release:
https://pypi.python.org/pypi/esptool/1.2

New since v1.1:

• New --flash_size default "detect" to interpret flash size from ID
• Warn when data is larger than flash.
• Support RFC2217 TCP serial ports (using pyserial serial_from_url)
• Use flasher stub for erase_flash (detects when erase is complete)
• pyserial v1.2 or newer is now required.
• README updates, minor bugfixes.

Thanks to @pfalcon, @jimparis, @jms19 for contributing to this release.