Added system-rules' dependency
Read more at http://www.stefan-birkner.de/system-rules/
CLI red
The 'it should out empty line on empty input' unit test is red
(compilation errors).
CLI red
The 'it should out empty line on empty input' unit test is red
(assertion errors).
CLI green
The 'it should out empty line on empty input' unit test is green.
CLI yellow
The 'it should out empty line on empty input' unit test has been refactored.
CLI red
The 'it should out one on one' unit test is red (assertion errors).
CLI green
The 'it should out one on one' unit test is green.
CLI red
The 'it should out empty line on empty input' unit test has been renamed to
'it should out noting on empty input' one and is red (assertion errors).
CLI green
The 'it should out noting on empty input' unit test is green.
CLI yellow
The CalculatorMainTest test suite has been refactored.
CLI red
The 'it should print evaluated expression result' unit rest is red
(assertion errors).
CLI green
The 'it should print evaluated expression result' unit rest is green.
CLI yellow
Refactoring of the main method.
Merge pull request #8 from ffbit/cli

CLI
Putting all together.