Commit initial maven structure
Code reformat for provided code
Merge branch 'feature/initial-structure' into develop
Implementation of AtomicDouble inspired by AtomicLong
Add test for AtomicDouble
Merge branch 'feature/atomic-double' into develop
First implementation of GasStation interface.

Need to test it and optimize todos
disable inspection SynchronizationOnLocalVariableOrMethodParameter
Add junit dependency to pom.xml and configure repositories
Update tests

Rename threads and simplify code
reimplement multithreaded test that is safe from mantissa presicion point of view
Update name in pom.xml
buyGas: return cost instead of revernue
removed todo about synchronized proxy

There is no sense to create syched proxy for gas pumps because they come from outside and
any can keep the reference to the original pump and do whatever without synchonization and
our efforts will be useless.
Simple test for default values
Add logging to configuration
Implement multithreaded test with revenue
Log4j will show only errors
Show warnings instead of errors, add exceptions tests
Add own log4j config to tests to see debug level