metro station support

Support for Metro station schedule monitoring (api v2 & v3).

support RATP Pierre Grimaud API v3 + tramways

support RATP Pierre Grimaud API v3 (and keep support previous v2 version)
support for tramways in v2 & v3

Velib trend

by default velib stations show their trend over the last hour

Bug Fix

Refresh issue
(+ feat beginning of Velib trending)

Velib Monitoring

Adding the possibility to monitor a list of velib version in term of space & bikes using the Paris Open Data

1st release (updated doc)

Update README.md

doc add screenshot