TESLA: EMAS and Bollinger Bands

This script is supposed to be used as part of the "TESLA" strategy in which the default values for the EMAs will serve as a trend indicator and dynamic support and resistance. Moreover, the bollinger bands will signal an overbought or oversold condition stating statistically the price will go up or down. This script features are:
- 3 EMAs which will response quicker than SMA to the new prices and will serve as dynamic support and resistance as well as trend indicators.
- 1 Bollinger band which will signal overbought and oversold conditions.