EMA 55 Crossover

Basically what this does is to flag when EMA 55 crosses over EMA 8, 13, 21, and 200. This strategy was described by @Philakone on this tweet , but I'm not really sure if this is the correct strategy he described.

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Fixing typo.

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After reading the comments it looks like EMA 200 shouldn't be taken in count for the crossover so I removed it from the crossover logic.