v0.2 - Alpha Release

added up trends & 0.2 minor fix/setup

- add both up and down trends as on 0.1 version just down trends were considered
- sample code updated (usage)
- created sample trendet gist (https://gist.github.com/alvarob96/98f94dcfec59f78a16ad2edbf464ce75)
- minor changes on docs