added GETTING_STARTED.md, updated README.md
added "Email" chapter
added:
link to Rubygems.org
some space in code-blocks;
headers size were changed.
some minor insertions
Merge pull request #65 from Sergey-Russiyan/develop

added GETTING_STARTED.md, updated README.md
Update README.md
Update README.md
Update .travis.yml
Update README.md
Update .travis.yml
Update spec_helper.rb
Update howitzer
Update howitzer_spec.rb
Update howitzer_spec.rb
fixed link heading to GETTING_STARTED.md file (it were directed to my clone project)
added "More information" chapter with 3 links.
Merge pull request #66 from Sergey-Russiyan/develop

Please, review my code. Were done some minor changes.
added "Logging" section
added "Logging" section and some minor cosmetic improvements
added "Logging" section and some minor cosmetic improvements
Merge pull request #67 from Sergey-Russiyan/develop

Please, review my code. Were added "Logging" chapter.