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This reverts commit f0824da3.

* [python] dont format string values with precision

* indent

* use compat.string_type

* remove parentheses

* removed excess import

* added tests for plotting trees in Python

* refined module_INSTALLED mechanism

* added note about that create_tree_digraph is better than plot_tree

Fixed #1454 

* add per-feature-penalites

* fix comment

* updated link to AMD APP SDK

* less cd commands

* update AMD APP SDK to 3.0.130.136 (latest)
* add a check for default device type in GPU tests (changes in config.h might break GPU tests)

* unpin boost version

* updated boost compute submodule

* Revert "[ci] run all examples at Appveyor (#1432)"

This reverts commit d0088c55.

* Revert "[ci] simplified and speeded up Travis (#1429)"

This reverts commit 0a3d4de7.

* bring gpu tests back

* corrected docs according to the news that AMD drops the support of AMD APP SDK

* replaced link to AMD APP SDK

* fixed downloading AMD APP SDK from GitHub without auth

* fixed path tp AMD APP SDK in docs

* removed exports

* clarify AMD APP SDK package installation condition

* fixed grammar

* fixed params description in graph plotting functions

* clarified types of attributes in their descriptions

* increased readability of graphs by adding spaces

* added precision parameter to plot tree functions

* removed excess whitespaces

* don't use built-in name for variable

* simplified line parsing

* chanched link to related

* run parameter_generator.py

* removed old targets

* use tuples instead of list where possible

* hotfix for descriptions were erased and only last one was kept

* run parameter_generator.py

* separated checks from aliases section

* refine Metric Parameters section

* refine Network Parameters section

* refine GPU Parameters section

refine Objective Parameters section

* refine IO Parameters section

* added missed alias of init_score

* fixed grammar

* fixed gpu test according new config file

* refine Learning Control Parameters section

* added missed check for length consistency of valid and valid init scores

* added missed aliases for core params

* added missed description of plot_example in python_guide folder and fixed consistency for packages naming

* more reliable OS detection

* fixed grammar

* made pylint happy

* generate parameters description from config file

* made pylint happy

* added checks description

* fixed links handling in desc and descl2 fields

* refine Core Parameters section

* removed excess quotes from default values

* fixed parameter type retrieve

* added note about auto-generated parameters

2.1.0 -> 2.1.1

Updated to correct path for the dockerfile (https://raw.githubusercontent.com/Microsoft/LightGBM/master/docker/gpu/dockerfile.gpu)