added render show_debug to show agent index - issue 146

See merge request flatland/flatland!151

Update flatland_2.0.md

See merge request flatland/flatland!150

Update flatland_2.0.md

See merge request flatland/flatland!149

Update flatland_2.0.md

See merge request flatland/flatland!148

added initial filel for intro to flatland 2.0

See merge request flatland/flatland!147

Update intro_observationbuilder.rst

See merge request flatland/flatland!146

Update intro_observationbuilder.rst

See merge request flatland/flatland!145

Stochasticbreaking

See merge request flatland/flatland!143

updated malfunction behavior. Now a train can break at any point during its travel. We don't count number of stops anymore. This is to simulate more complex stochastic events.

# Conflicts:
#   examples/training_example.py

143 multi speed initialization

See merge request flatland/flatland!144

140 predictor multi speed

See merge request flatland/flatland!141

# Conflicts:
#   examples/training_example.py

139 update observation multi speed

Closes #139

See merge request flatland/flatland!142

Update rst docs

See merge request flatland/flatland!140