Added class header file, class implementation and documentation. Also changed index.rst
Merge branch 'master' of https://github.com/dmitryvodop/devtools-course
Fixed a small mistake
Changed LengthConvertor.h and lengthconvertor.rst
Fixed the description of the class method in the file lengthconvertor.rst and added "void" in parameter of class constructor in LengthConvertor.h
Fixed .h and .rst
Fixed a small bug in .rst file
Merge pull request #21 from dmitryvodop/master

[KK] D. Vodopyanov. Lab #2