http server based OTA feature added

Now you can update your esp8266 through internet (no need to connect to same network).

Requirement:

1. You need web server to place firmware

Implemented Blynk offline - code to run without internet

Implemented code to run offline, timer in settings

Implemented code to run without internet connection. Blynk blocking code
to run without internet on startup, now this drawback has been removed.
Now code runs without internet and try to reconnect every 30seconds if
no internet has found.

Implemented timer values in settings.h file. user can change values
directly on settings.h file than searching in program.

changed few functions names