Merge tag 'HTTP_GET'

Add implementation of the HTTP GET method
Merge tag 'HTTP_PUT'

Add implementation of the HTTP PUT method
Add class definition for configuration
Modify configuration skeleton to avoid conflicts with LibConfig
Change .gitignore to enable cmake directory
Create FindLibConfig++.cmake file to provide ability to find libconfig++ library by the cmake
Change Config constructor to provide information about configuration file and path
Add basic tests for configuration
Add extra line breaks to make test cases more readable
Merge branch 'feature/configuration'
Rename config.h to config.hpp
Move stringutils.hpp to the 'inc' directory
Move restclient.hpp to the 'inc' directory
Move config.hpp to the 'inc' directory
Move restclient.cpp to the 'src' directory
Move config.cpp to the 'src' directory
Move stringutils.cpp to the 'src' directory
Remove utils directory
Add 'inc' directory to the tests project
Rename configtest.h and move it to the 'inc' directory