Pyscript 1.2.1 release

The 1.2.1 release contains several bug fixes:

• Fixed @time_active so that ranges without dates (eg: plain sunrise, sunset or fixed times) work correctly on days after HASS was started. Reported by @markwhibbard; fix confirmed by @markwhibbard and @patrickfnielsen; see #149.
• lambda functions are now compiled so they are native python lambda functions that can be called from filter, map or anywhere that expects a regular python function. Reported by Greg sj3fk3.
• Raise an exception when a local variable is used before setting. Previously if a variable of the same name was defined globally, it was incorrectly used instead.
• Minor documentation fix regarding yaml file includes, submitted by @wsw70; see #153, #154.

Enjoy!