Merge pull request #53 from EngForDev/ko

#20 update korean translation
Fix grammar and spelling for Spork advice
Merge pull request #54 from andyw8/patch-1

Fix grammar and spelling for Spork advice
correct readme
Merge pull request #55 from Passionate/patch-1

correct readme
Mention should_not and should_clean in "Don't use should"
Remove "should" from test description.

This is consistent with the move away from 'should'. Leave the test code using `should` instead of `expect` to be consistent with the other test code blocks.
Remove duplicate line in "Use let and let!"

Removes duplicate:
context 'when updates a not existing property value' do
Merge pull request #56 from mark-rushakoff/should_not

Mention should_not and should_clean in "Don't use should"
Merge pull request #57 from cupakromer/patch-1

Remove "should" from test description.
Merge pull request #58 from samward/master

Remove duplicate line in "Use let and let!"
Better README
typo
grammar
Merge pull request #60 from szTheory/patch-1

typo
Merge pull request #61 from szTheory/master

grammar
Add russian language #20
Merge pull request #63 from killthekitten/ru-i18n

Add russian language
Update Korean language #20