LSTMVis 2.1 (Python 3 release)

ended Python 2.7 version

LSTMVis 2.0

Merge branch 'master' into V2

# Conflicts:
#	client/V2_tester.html
#	client/css/vis/heatmap.css
#	client/css/vis/lineplot.css
#	client/js/.eslintrc.js
#	client/js/etc/global_helper.js
#	client/js/pattern_finder.js
#	client/js/test/test_simple.js
#	client/js/vis/heatmap.js
#	client/js/vis/lineplot.js
#	client/js/vis/vcomponent.js
#	docs/chapter/train.md
#	lstmdata/data_handler.py
#	model/get_states.lua
#	server.py