Merge pull request #15 from Kloadut/master

[tests] createDirectoryDoc test + refactoring of big query
add db tests
add fixes following db tests
add config test file
Merge branch 'master' of github.com:cozy-labs/cozy-data-proxy
fix help
handle better when there is not given devie/cozy in the configuration
create test dir before binary tests
add coffeelint configuration
prepare npm packaging
improve logging
Merge pull request #16 from Kloadut/master

[tests] createFileDoc test + refactoring of big query
[fix] Finish tests + package.json typo + refactoring of the last epic query