All Technical Indicators with live data

[omendram]

Currently the classes are using the database, which is good for training but still there's an extension needed for the live data from API responses or the streams.

[CamielK]

TODO:

• get last n candles from live data
• apply the TA library on them
• return the correct columns

Would probably be easiest if an extra parameter is added to the retrieval function
e.g.: get_bollinger_bands(n=60, live=True/False)