Merge pull request #12 from monroid/master

Documentation refactoring
English translation
Some documentation fixes
Merge pull request #1 from dmitryilyin/master

Some documentation fixes
Finish english translation
Merge pull request #2 from dmitryilyin/master

Finish english translation
Minor fixes.
Merge pull request #14 from korshenin/master

English translation 2
Translate images and latex fixes
Merge pull request #15 from dmitryilyin/master

Translate images and latex fixes
grammar-fixes