Merge pull request #16 from hedgss/master

Merged pull request #16 from hedgss/master
Merge pull request #1 from Dmitry404/master

week1 pull request
week1 Alexey Todorov
Merge pull request #18 from alextod/master

Alexey Todorov - week1 has been done
Merge pull request #17 from hedgss/master

Vyacheslav Shevtsov - week1 has been done
Week2 template
Week2 questions and exercises (draft)
A few grammar fixes
Week2 - added an additional question
At lasT!
Merge pull request #20 from sebulbas/master

Michael Grigoriev - week 1 has been done